RFR: 7903796: JMH: Switch to latest GHA runners

[Aleksey Shipilev]

JMH currently runs macos-11 for the runners, which are scarce. Developers likely do not have access to macos-11 VMs for debugging too. Since we just want to check that JMH works on some OS flavors, we might as well switch to latest runners.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jmh/pull/134/files
  Webrev: https://webrevs.openjdk.org/?repo=jmh&pr=134&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903796
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jmh/pull/134.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/134/head:pull/134

PR: https://git.openjdk.org/jmh/pull/134