Github Actions: Ubuntu and action version

.github/workflows/tests.yml

@@ -10,7 +10,7 @@ on:
 
 jobs:
     php-tests:
-        runs-on: ubuntu-18.04
+        runs-on: ubuntu-22.04
         strategy:
             matrix:
                 include:
@@ -26,7 +26,7 @@ jobs:
 
         steps:
             - name: Checkout repository
-              uses: actions/checkout@v2
+              uses: actions/checkout@v4
 
             - name: Setup PHP
               uses: shivammathur/setup-php@v2
@@ -36,7 +36,7 @@ jobs:
                   coverage: none
 
             - name: Cache Composer dependencies
-              uses: actions/cache@v2
+              uses: actions/cache@v4
               with:
                   path: /tmp/composer-cache
                   key: ${{ runner.os }}-${{ hashFiles('**/composer.lock') }}