chore: update macOS runner version to 15 in release workflow

Author: jimzer

.github/workflows/release.yaml

@@ -139,9 +139,7 @@ jobs:
     strategy:
       matrix:
         platform:
-          - runner: macos-13
-            target: x86_64
-          - runner: macos-14
+          - runner: macos-15
             target: aarch64
 
   build-sdist: