Adding 'setup-php' plugin

Fixing broken php version pointer

Author: danny-gallagher

.github/workflows/sonar.yml

@@ -14,6 +14,11 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Install PHP
+      uses: shivammathur/setup-php@v2
+      with:
+        php-version: 7.4
+        coverage: xdebug
     - name: Setup java
       uses: actions/setup-java@v1
       with: