[jdk21u-dev] RFR: 8311792: java/net/httpclient/ResponsePublisher.java fails intermittently with AssertionError: Found some outstanding operations

[Goetz Lindenmaier]

I backport this for parity with 21.0.4-oracle.

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Commit messages:
 - Backport 1664e793eb725d6328751657d5718df96175da29

Changes: https://git.openjdk.org/jdk21u-dev/pull/320/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=320&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8311792
  Stats: 58 lines in 1 file changed: 58 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/320.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/320/head:pull/320

PR: https://git.openjdk.org/jdk21u-dev/pull/320