[java-spanner] OpenTelemetryApiTracerTest.testExecuteUpdate is flaky

```
Error: Tests run: 11, Failures: 1, Errors: 0, Skipped: 0, Time elapsed: 0.358 s <<< FAILURE! -- in com.google.cloud.spanner.OpenTelemetryApiTracerTest
Error: com.google.cloud.spanner.OpenTelemetryApiTracerTest.testExecuteUpdate -- Time elapsed: 0.031 s <<< FAILURE!
java.lang.AssertionError:
Expected
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.DeleteSession
Spanner.BatchCreateSessions
CloudSpannerOperation.BatchCreateSessionsRequest
CloudSpannerOperation.BatchCreateSessions
Spanner.BatchCreateSessions
CloudSpannerOperation.BatchCreateSessionsRequest
CloudSpannerOperation.BatchCreateSessions
Spanner.BatchCreateSessions
CloudSpannerOperation.BatchCreateSessionsRequest
CloudSpannerOperation.BatchCreateSessions
Spanner.BatchCreateSessions
CloudSpannerOperation.BatchCreateSessionsRequest
CloudSpannerOperation.BatchCreateSessions
CloudSpannerOperation.ExecuteUpdate
Spanner.Commit
CloudSpannerOperation.Commit
CloudSpanner.ReadWriteTransaction
to contain Spanner.ExecuteSql
at org.junit.Assert.fail(Assert.java:89)
at org.junit.Assert.assertTrue(Assert.java:42)
at com.google.cloud.spanner.OpenTelemetryApiTracerTest.assertContains(OpenTelemetryApiTracerTest.java:453)
at com.google.cloud.spanner.OpenTelemetryApiTracerTest.testExecuteUpdate(OpenTelemetryApiTracerTest.java:173)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.junit.internal.runners.statements.RunAfters.evaluate(RunAfters.java:27)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.junit.runners.Suite.runChild(Suite.java:128)
at org.junit.runners.Suite.runChild(Suite.java:27)
at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
at org.apache.maven.surefire.junitcore.JUnitCore.run(JUnitCore.java:49)
at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.createRequestAndRun(JUnitCoreWrapper.java:120)
at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.executeEager(JUnitCoreWrapper.java:95)
at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:75)
at org.apache.maven.surefire.junitcore.JUnitCoreWrapper.execute(JUnitCoreWrapper.java:69)
at org.apache.maven.surefire.junitcore.JUnitCoreProvider.invoke(JUnitCoreProvider.java:146)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:385)
at org.apache.maven.surefire.booter.ForkedBooter.execute(ForkedBooter.java:162)
at org.apache.maven.surefire.booter.ForkedBooter.run(ForkedBooter.java:507)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:495)

```