try to fix tests

.github/workflows/phpunit.yml

@@ -24,20 +24,23 @@ jobs:
           - "windows-latest"
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@v2"
+        uses: "actions/checkout@v4"
       - name: "Install PHP"
         uses: "shivammathur/setup-php@v2"
         with:
           coverage: "pcov"
           php-version: "${{ matrix.php-version }}"
           ini-values: memory_limit=-1
       - name: "Install lowest dependencies"
+        uses: "ramsey/composer-install@v3"
         if: ${{ matrix.dependencies == 'lowest' }}
         run: "composer update --prefer-lowest --no-interaction --no-progress --no-suggest"
       - name: "Install highest dependencies"
+        uses: "ramsey/composer-install@v3"
         if: ${{ matrix.dependencies == 'highest' }}
         run: "composer update --no-interaction --no-progress --no-suggest"
       - name: "Install locked dependencies"
+        uses: "ramsey/composer-install@v3"
         if: ${{ matrix.dependencies == 'locked' }}
         run: "composer install --no-interaction --no-progress --no-suggest"
       - name: "Tests"