ci: upgrade checkout action

Author: FlyAndNotDown

.github/workflows/build.yml

@@ -35,7 +35,7 @@ jobs:
         if: runner.os == 'macOS'
 
       - name: Checkout Repo
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup cmake
         uses: jwlawson/actions-setup-cmake@v2