Use macos 15 in build.yml

Author: hermantb

.github/workflows/build.yml

@@ -14,15 +14,15 @@ jobs:
       run: ./configure && make && make test -k
 
   test-x86_64-osx:
-    runs-on: macos-13
+    runs-on: macos-15-intel
     timeout-minutes: 2
     steps:
     - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
     - name: make & test tcc (x86_64-osx)
       run: ./configure && make && make test -k
 
   test-aarch64-osx:
-    runs-on: macos-14
+    runs-on: macos-15
     timeout-minutes: 2
     steps:
     - uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0