install llvm 增加条件

Author: wokron

.github/workflows/pr-check.yml

@@ -44,7 +44,7 @@ jobs:
     - uses: actions/checkout@v4
 
     - name: Install llvm
-      if: matrix.stage == 'llvm'
+      if: ${{ matrix.stage == 'llvm' && matrix.os != 'macos-14' }}
       uses: KyleMayes/install-llvm-action@v2
       with:
         version: "16.0"