Update actions/checkout action to v4 (#7)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/codeql.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3.5.3
+      uses: actions/checkout@v4.0.0
 
     # Initializes the CodeQL tools for scanning.
     - name: Initialize CodeQL