HP-1751 keep using shivammathur/setup-php@v2

Author: VadymHrechukha

.github/workflows/phpunit-tests.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install PHP
-        uses: shivammathur/setup-php@v3
+        uses: shivammathur/setup-php@v2
         with:
           php-version: ${{ matrix.php }}
           extensions: gmp