Run trunk deploy tests against PHP 7 instead of PHP 5.6

Author: danielbachhuber

.github/workflows/deployment.yml

@@ -71,13 +71,13 @@ jobs:
         wp: ['latest']
         mysql: ['8.0']
         include:
-          - php: '5.6'
+          - php: '7.0'
             wp: 'trunk'
             mysql: '8.0'
-          - php: '5.6'
+          - php: '7.0'
             wp: 'trunk'
             mysql: '5.7'
-          - php: '5.6'
+          - php: '7.0'
             wp: 'trunk'
             mysql: '5.6'
           - php: '7.4'