Revert "CI: Pin Python 3.12.3 to workaround GHA issue"

[Repiteo]

• Reverts CI: Pin Python 3.12.3 to workaround GHA issue (reverted) #92967
• Supersedes CI: Bump GHA Python/SCons to latest versions #94271

The pinned version is no longer needed, as the issue in question was fixed via actions/python-versions#286. In the future, this kind of change shouldn't be necessary, as runners requiring different builds can simply supply a pinned python version instead. If the issue was still present, the preferred implementation would be:

# macos_builds.yml
...
      - name: Setup Python and SCons
        uses: ./.github/actions/godot-deps
        with:
          # Workaround GHA unable to extract 3.12.4 tarball
          python-version: 3.12.3
...

[akien-mga]

Thanks!