Update macos-scan-build.yml

Clang scan on macos 12

Author: opcm

.github/workflows/macos-scan-build.yml

@@ -9,7 +9,7 @@ on:
 jobs:
   build:
 
-    runs-on: macos-11
+    runs-on: macos-12
 
     steps:
     - uses: actions/checkout@v2