fix: PHPUnit testcase error

Author: girishpanchal30

.github/workflows/test-php.yml

@@ -15,7 +15,7 @@ jobs:
       - name: Setup PHP version
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.1'
+          php-version: '7.4'
           extensions: simplexml
       - name: Checkout source code
         uses: actions/checkout@v2
@@ -51,7 +51,7 @@ jobs:
       - name: Setup PHP version
         uses: shivammathur/setup-php@v2
         with:
-          php-version: '7.1'
+          php-version: '7.4'
           extensions: simplexml, mysql
           tools: phpunit-polyfills
       - name: Checkout source code