Update actions/checkout to v4 (#23)

Author: ste93cry

.github/workflows/publish-release.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     name: Release version
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           token: ${{ secrets.GH_RELEASE_PAT }}
           fetch-depth: 0

.github/workflows/tests.yaml

@@ -53,7 +53,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2