Update macos runner to macos-14

The macos-12 image is deprecated.

Author: seddonym

.github/workflows/release.yml

@@ -108,7 +108,7 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: macos-12
+          - runner: macos-14
             target: x86_64
           - runner: macos-14
             target: aarch64