THX-1138: Update checkout version

Author: AlexAtkinson

action.yml

@@ -24,7 +24,7 @@ runs:
   using: "composite"
   steps:
     - name: Checkout
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
     - name: Ensure full commit history
       run: |
           cd $GITHUB_WORKSPACE
@@ -68,4 +68,4 @@ runs:
       shell: bash
 
 # See github contexts for more like github.action_path.
-# REF: https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
+# REF: https://docs.github.com/en/actions/learn-github-actions/contexts#github-context