[jdk21u] RFR: 8313428: GHA: Bump GCC versions for July 2023 updates

Wed Aug 2 08:43:11 UTC 2023

Clean backport to unbreak GHA.

Additional testing:
 - [ ] GHA

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Commit messages:
 - Backport ec2f38fd389dc51dc4d8925e037a8bf2e64a3722

Changes: https://git.openjdk.org/jdk21u/pull/33/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk21u&pr=33&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8313428
  Stats: 9 lines in 1 file changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk21u/pull/33.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u.git pull/33/head:pull/33

PR: https://git.openjdk.org/jdk21u/pull/33