Use macos-12 for builds

Author: yukibtc

.github/workflows/publish-swift-package.yaml

@@ -15,7 +15,7 @@ on:
 jobs:
   build-tag-release:
     name: Build, tag, and release the Nostr SDK Swift bindings
-    runs-on: macOS-latest
+    runs-on: macos-12
     permissions:
       contents: write
     steps: