RFR: 8369683: Exclude runtime/Monitor/MonitorWithDeadObjectTest.java#DumpThreadsBeforeDetach on Alpine Linux debug

[Christoph Langer]

Since the test runtime/Monitor/MonitorWithDeadObjectTest.java#DumpThreadsBeforeDetach is constantly failing for debug builds on Linux Alpine, let's exclude it there for the time being.

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Commit messages:
 - JDK-8369683

Changes: https://git.openjdk.org/jdk/pull/27770/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27770&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369683
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/27770.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27770/head:pull/27770

PR: https://git.openjdk.org/jdk/pull/27770