[jdk21u-dev] RFR: 8293713: java/net/httpclient/BufferingSubscriberTest.java fails in timeout, blocked in submission publisher

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle, but to 21.0.9.

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Commit messages:
 - Backport 5224e979a1cbce1b015e81aa7761743f60357d73

Changes: https://git.openjdk.org/jdk21u-dev/pull/2102/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2102&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293713
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2102.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2102/head:pull/2102

PR: https://git.openjdk.org/jdk21u-dev/pull/2102