drop versions 5.6, 7.0 and 7.1 from test

Author: adityapatadia

.github/workflows/php-testing.yml

@@ -9,7 +9,7 @@ jobs:
       fail-fast: false
       matrix:
         operating-system: [ubuntu-20.04]
-        php-versions: ['5.6', '7.0', '7.1', '7.2', '7.3', '7.4', '8.0', '8.1']
+        php-versions: ['7.2', '7.3', '7.4', '8.0', '8.1']
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
     steps:
     - name: Checkout