RFR: 8354230: Wrong boot jdk for alpine-linux-x64 in GHA

[Mikael Vidstedt]

[JDK-8342984](https://bugs.openjdk.org/browse/JDK-8342984) bumped the minimum boot jdk to JDK 24, and update the boot JDKs used in GHA in the process. Unfortunately the boot jdk for alpine-linux-x64 was incorrectly changed to use the linux-*aarch64* version.

Testing: GHA, incl. explicitly triggering/building of alpine-linux-x64

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Commit messages:
 - 8354230: Wrong boot jdk for alpine-linux-x64 in GHA

Changes: https://git.openjdk.org/jdk/pull/24557/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24557&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354230
  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/24557.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24557/head:pull/24557

PR: https://git.openjdk.org/jdk/pull/24557