ci: use macos-14 image in ci

Author: thunderbiscuit

.github/workflows/publish-spm.yaml

@@ -14,7 +14,7 @@ on:
 jobs:
   build-publish:
     name: Build, tag and create release
-    runs-on: macos-12
+    runs-on: macos-14
     steps:
       - name: "Checkout build repo"
         uses: actions/checkout@v4