Run tests on PHP 8.3

.github/workflows/tests.yaml

@@ -13,15 +13,15 @@ jobs:
 
     strategy:
       matrix:
-        php-version: ['7.3', '7.4', '8.0', '8.1', '8.2']
+        php-version: ['7.3', '7.4', '8.0', '8.1', '8.2', '8.3']
         dependencies: ['']
         include:
           - { php-version: '7.3', dependencies: '--prefer-lowest --prefer-stable' }
 
     name: Unit tests - PHP ${{ matrix.php-version }} ${{ matrix.dependencies }}
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -59,7 +59,7 @@ jobs:
     name: Integration tests (Selenium ${{ matrix.selenium-version }})
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
 
       - name: Setup PHP
         uses: shivammathur/setup-php@v2
@@ -118,7 +118,7 @@ jobs:
       name: "Code style and static analysis"
       runs-on: ubuntu-latest
       steps:
-        - uses: actions/checkout@v3
+        - uses: actions/checkout@v4
 
         - name: Setup PHP
           uses: shivammathur/setup-php@v2
@@ -139,7 +139,7 @@ jobs:
     name: "Markdown link check"
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: gaurav-nelson/github-action-markdown-link-check@v1
         with:
           use-verbose-mode: 'yes'