ci: update macos x86_64 build runner to macos-15-large

The macos-13 runner is being deprecated. Migrate the x86_64 macOS
build job to macos-15-large to ensure continued CI availability.

Author: appcypher

.github/workflows/release.yml

@@ -116,7 +116,7 @@ jobs:
 
   build-macos-x86_64:
     name: Build macOS x86_64
-    runs-on: macos-13
+    runs-on: macos-15-large
     needs: build-linux-x86_64
     steps:
       - name: Code checkout