jdk_net_0 test failing on AIX during jdk 18+36 release

Failing jdk_net test from the extended openjdk test suite are failing on aix due to a timeout error:

`com/sun/net/httpserver/simpleserver/StressDirListings.java.StressDirListings`
```
20:04:16 TEST RESULT: Error. Program `/home/jenkins/workspace/Grinder/openjdkbinary/j2sdk-image/bin/java' timed out (timeout set to 960000ms, elapsed time including timeout handling was 960490ms).
```

Test job https://ci.adoptopenjdk.net/job/Test_openjdk18_hs_extended.openjdk_ppc64_aix_testList_0/24/testReport/
Trss link https://trss.adoptium.net/output/test?id=623b9dc672761a4c5cf8bf34

Fails in the same way in 2 reruns https://ci.adoptopenjdk.net/job/Grinder/3950/console and https://ci.adoptopenjdk.net/job/Grinder/3949/console

Start with com/sun/net/httpserver/simpleserver/StressDirListings.java.StressDirListings and the linked AIX test and Grinder logs; confirm the timeout is reproducible. Done means the jdk_net_0 test completes successfully on AIX without exceeding the 960000ms timeout.

Written by the indexing model from the issue text.