failed: org.apache.pekko.actor.dispatch.DispatcherActorSpec

refs: https://github.com/apache/pekko/actions/runs/12837234599/job/35800491988?pr=1724#step:7:5795

```scala
01-17 21:46:48.292] [info] - must respect the throughput setting *** FAILED *** (10 seconds, 46 milliseconds)
[01-17 21:46:48.292] [info] DispatcherActorSpec.this.convertToCheckingEqualizer[scala.Long](latch.getCount()).===[scala.Long](0L)(DispatcherActorSpec.this.typeCheckedConstraint[scala.Long, scala.Long](org.scalactic.Equivalence.default[scala.Long], scala.<:<.refl[scala.Long])) was false (DispatcherActorSpec.scala:111)
[01-17 21:46:48.293] [info] org.scalatest.exceptions.TestFailedException:
[01-17 21:46:48.293] [info] at org.scalatest.Assertions.newAssertionFailedException(Assertions.scala:476)
[01-17 21:46:48.293] [info] at org.scalatest.Assertions.newAssertionFailedException$(Assertions.scala:421)
[01-17 21:46:48.293] [info] at org.scalatest.Assertions$.newAssertionFailedException(Assertions.scala:1385)
[01-17 21:46:48.293] [info] at org.scalatest.Assertions$AssertionsHelper.macroAssert(Assertions.scala:1460)
[01-17 21:46:48.293] [info] at org.apache.pekko.actor.dispatch.DispatcherActorSpec.f$proxy3$1(DispatcherActorSpec.scala:111)
[01-17 21:46:48.293] [info] at org.apache.pekko.actor.dispatch.DispatcherActorSpec.$init$$$anonfun$1$$anonfun$3(DispatcherActorSpec.scala:86)
[01-17 21:46:48.295] [info] at org.scalatest.Transformer.apply$$anonfun$1(Transformer.scala:22)
[01-17 21:46:48.295] [info] at org.scalatest.OutcomeOf.outcomeOf(OutcomeOf.scala:85)
[01-17 21:46:48.295] [info] at org.scalatest.OutcomeOf.outcomeOf$(OutcomeOf.scala:31)
[01-17 21:46:48.295] [info] at org.scalatest.OutcomeOf$.outcomeOf(OutcomeOf.scala:104)
[01-17 21:46:48.295] [info] at org.scalatest.Transformer.apply(Transformer.scala:22)
[01-17 21:46:48.296] [info] at org.scalatest.Transformer.apply(Transformer.scala:21)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike$$anon$3.apply(AnyWordSpecLike.scala:1118)
[01-17 21:46:48.296] [info] at org.scalatest.TestSuite.withFixture(TestSuite.scala:196)
[01-17 21:46:48.296] [info] at org.scalatest.TestSuite.withFixture$(TestSuite.scala:138)
[01-17 21:46:48.296] [info] at org.apache.pekko.testkit.PekkoSpec.withFixture(PekkoSpec.scala:80)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike.invokeWithFixture$1(AnyWordSpecLike.scala:1124)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$$anonfun$1(AnyWordSpecLike.scala:1128)
[01-17 21:46:48.296] [info] at org.scalatest.SuperEngine.runTestImpl(Engine.scala:306)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest(AnyWordSpecLike.scala:1128)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTest$(AnyWordSpecLike.scala:44)
[01-17 21:46:48.296] [info] at org.apache.pekko.testkit.PekkoSpec.runTest(PekkoSpec.scala:80)
[01-17 21:46:48.296] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$$anonfun$1(AnyWordSpecLike.scala:1187)
[01-17 21:46:48.296] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:413)
[01-17 21:46:48.296] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[01-17 21:46:48.296] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[01-17 21:46:48.296] [info] at scala.collection.immutable.List.foreach(List.scala:334)
[01-17 21:46:48.296] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429)
[01-17 21:46:48.296] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:390)
[01-17 21:46:48.297] [info] at org.scalatest.SuperEngine.traverseSubNodes$1$$anonfun$1(Engine.scala:427)
[01-17 21:46:48.297] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:15)
[01-17 21:46:48.297] [info] at scala.runtime.function.JProcedure1.apply(JProcedure1.java:10)
[01-17 21:46:48.297] [info] at scala.collection.immutable.List.foreach(List.scala:334)
[01-17 21:46:48.297] [info] at org.scalatest.SuperEngine.traverseSubNodes$1(Engine.scala:429)
[01-17 21:46:48.297] [info] at org.scalatest.SuperEngine.runTestsInBranch(Engine.scala:396)
[01-17 21:46:48.297] [info] at org.scalatest.SuperEngine.runTestsImpl(Engine.scala:475)
[01-17 21:46:48.297] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests(AnyWordSpecLike.scala:1187)
[01-17 21:46:48.297] [info] at org.scalatest.wordspec.AnyWordSpecLike.runTests$(AnyWordSpecLike.scala:44)
[01-17 21:46:48.297] [info] at org.apache.pekko.testkit.PekkoSpec.runTests(PekkoSpec.scala:80)
[01-17 21:46:48.297] [info] at org.scalatest.Suite.run(Suite.scala:1114)
[01-17 21:46:48.297] [info] at org.scalatest.Suite.run$(Suite.scala:564)
[01-17 21:46:48.297] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$wordspec$AnyWordSpecLike$$super$run(PekkoSpec.scala:80)
[01-17 21:46:48.297] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$$anonfun$1(AnyWordSpecLike.scala:1232)
[01-17 21:46:48.297] [info] at org.scalatest.SuperEngine.runImpl(Engine.scala:535)
[01-17 21:46:48.297] [info] at org.scalatest.wordspec.AnyWordSpecLike.run(AnyWordSpecLike.scala:1232)
[01-17 21:46:48.298] [info] at org.scalatest.wordspec.AnyWordSpecLike.run$(AnyWordSpecLike.scala:44)
[01-17 21:46:48.298] [info] at org.apache.pekko.testkit.PekkoSpec.org$scalatest$BeforeAndAfterAll$$super$run(PekkoSpec.scala:80)
[01-17 21:46:48.298] [info] at org.scalatest.BeforeAndAfterAll.liftedTree1$1(BeforeAndAfterAll.scala:213)
[01-17 21:46:48.298] [info] at org.scalatest.BeforeAndAfterAll.run(BeforeAndAfterAll.scala:217)
[01-17 21:46:48.298] [info] at org.scalatest.BeforeAndAfterAll.run$(BeforeAndAfterAll.scala:135)
[01-17 21:46:48.298] [info] at org.apache.pekko.testkit.PekkoSpec.run(PekkoSpec.scala:80)
[01-17 21:46:48.298] [info] at org.scalatest.tools.Framework.org$scalatest$tools$Framework$$runSuite(Framework.scala:321)
[01-17 21:46:48.298] [info] at org.scalatest.tools.Framework$ScalaTestTask.execute(Framework.scala:517)
[01-17 21:46:48.298] [info] at sbt.ForkMain$Run.lambda$runTest$1(ForkMain.java:414)
[01-17 21:46:48.298] [info] at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
[01-17 21:46:48.298] [info] at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[01-17 21:46:48.298] [info] at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[01-17 21:46:48.303] [info] at java.base/java.lang.Thread.run(Thread.java:829)
```

Start with DispatcherActorSpec.scala, especially the "must respect the throughput setting" test and the assertion at line 111; reproduce the failure using the DispatcherActorSpec test entry point. Trace the latch and throughput behavior shown by the test, and consider the issue done when the test reliably passes without weakening its assertion.

Written by the indexing model from the issue text.