RFR: 8292262: adjust timeouts in several M&M tests

[Daniel D. Daugherty]

Trivial fixes to adjust timeouts in several M&M tests.

This fix is being tested in my jdk-20+10 stress testing.

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Commit messages:
 - 8292262: adjust timeouts in several M&M tests

Changes: https://git.openjdk.org/jdk/pull/9847/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9847&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8292262
  Stats: 4 lines in 4 files changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/9847.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9847/head:pull/9847

PR: https://git.openjdk.org/jdk/pull/9847