Merged revision(s) 21510 from branches/OpenMPT-1.30:

[Fix] build: CI: GitHub: macOS: Work-around Homebrew non-dependency-handling. Pin swiftlint.
........


git-svn-id: https://source.openmpt.org/svn/openmpt/branches/OpenMPT-1.28@21512 56274372-70c3-4bfc-bfc3-4c3a0b034d27

.github/workflows/macOS-12-Makefile.yml

@@ -15,6 +15,8 @@ jobs:
 
     steps:
     - uses: actions/checkout@v4
+    - name: fixup GitHub Homebrew swiftlint breakage
+      run: brew pin swiftlint
     - name: fixup GitHub Homebrew xcbeautify breakage
       run: brew pin xcbeautify
     - name: fixup GitHub Homebrew node breakage