Bump actions/checkout from 3 to 4 (#136)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/php-linter.yml

@@ -13,7 +13,7 @@ jobs:
     if: github.event.pull_request.draft == false
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           repository: ${{ github.event.client_payload.pull_request.head.repo.full_name }}
           ref: ${{ github.event.client_payload.pull_request.head.ref }}

.github/workflows/static-analysis.yml

@@ -28,7 +28,7 @@ jobs:
 
         steps:
             -   name: Checkout
-                uses: actions/checkout@v3
+                uses: actions/checkout@v4
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2

.github/workflows/unit-tests.yml

@@ -27,7 +27,7 @@ jobs:
 
         steps:
             -   name: Checkout
-                uses: actions/checkout@v3
+                uses: actions/checkout@v4
 
             -   name: Setup PHP
                 uses: shivammathur/setup-php@v2