chore: use macos 15 in action

Author: DominicGBauer

.github/workflows/temp-spm-test.yml

@@ -4,7 +4,7 @@ name: "temp test spm"
 jobs:
   build:
     name: Building iOS
-    runs-on: macos-latest
+    runs-on: macos-15
     steps:
       - uses: actions/checkout@v3
         with: