[jdk25u] RFR: 8361478: GHA: Use MSYS2 from GHA runners

[Aleksey Shipilev]

Improves GHA performance. The patch was in mainline for a week, and we have seen no problems with it.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport ed9066bdf48c2d9925aea745951531ebf4af35a8

Changes: https://git.openjdk.org/jdk25u/pull/60/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk25u&pr=60&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8361478
  Stats: 5 lines in 1 file changed: 1 ins; 1 del; 3 mod
  Patch: https://git.openjdk.org/jdk25u/pull/60.diff
  Fetch: git fetch https://git.openjdk.org/jdk25u.git pull/60/head:pull/60

PR: https://git.openjdk.org/jdk25u/pull/60