CI: test with PHP 8.4, update action versions

Author: aldas

.github/workflows/php.yml

@@ -15,10 +15,11 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest]
-        php-version: ['8.0', '8.1', '8.2', '8.3']
+        # See https://www.php.net/supported-versions.php
+        php-version: ['8.1', '8.2', '8.3', '8.4']
     name: PHP ${{ matrix.php-version }} Test on ${{ matrix.operating-system }}
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
 
     - name: Setup PHP
       uses: shivammathur/setup-php@v2
@@ -41,8 +42,8 @@ jobs:
       run: composer test-ci
 
     - name: Upload coverage to Codecov
-      if: matrix.php-version == '8.3' &&  matrix.operating-system == 'ubuntu-latest'
-      uses: codecov/codecov-action@v3
+      if: matrix.php-version == '8.4' &&  matrix.operating-system == 'ubuntu-latest'
+      uses: codecov/codecov-action@v5
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./report/coverage.xml