Update ci-macos.yml

Author: ctreffs

.github/workflows/ci-macos.yml

@@ -14,7 +14,7 @@ jobs:
         xcode: ["14.2"]
     steps:
       - name: Checkout
-        uses: actions/checkout@master
+        uses: actions/checkout@v3.5.2
 
       - name: Select Xcode ${{ matrix.xcode }}
         run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode }}.app