Update actions/checkout action to v4 (#515)

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

.github/workflows/pull_request.yaml

@@ -24,7 +24,7 @@ jobs:
     if: "! contains(toJSON(github.event.commits.*.message), '[skip-ci]')"
     steps:
     - name: Check out code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         ref: ${{github.event.pull_request.head.sha}}
 

.github/workflows/push.yaml

@@ -20,7 +20,7 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           token: ${{ secrets.STAKATER_GITHUB_TOKEN }}        
           fetch-depth: 0 # otherwise, you will fail to push refs to dest repo

.github/workflows/release.yaml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Check out code
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           fetch-depth: 0 # See: https://goreleaser.com/ci/actions/