Switch to macOS-15 runner image

Author: botder

.github/workflows/build.yaml

@@ -52,15 +52,15 @@ jobs:
 
   macOS:
     name: macOS
-    runs-on: macOS-13
+    runs-on: macOS-15
     steps:
       - uses: actions/checkout@v4
 
-      - name: Set environment variables for GCC 15
+      - name: Set environment variables
         run: |
-          echo "CC=$(brew --prefix gcc@15)/bin/gcc-15" >> $GITHUB_ENV
-          echo "CXX=$(brew --prefix gcc@15)/bin/g++-15" >> $GITHUB_ENV
-          echo "AR=$(brew --prefix gcc@15)/bin/gcc-ar-15" >> $GITHUB_ENV
+          echo "AR=$(xcrun --find ar)" >> $GITHUB_ENV
+          echo "CC=$(xcrun --find clang)" >> $GITHUB_ENV
+          echo "CXX=$(xcrun --find clang++)" >> $GITHUB_ENV
 
       - name: Install MySQL
         run: brew install mysql