Remove PHP 7.4 and 8.0 from the test matrix in diagnostics workflow

Author: dmolineus

.github/workflows/diagnostics.yml

@@ -16,12 +16,6 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - php: 7.4
-            output: '-o github-action -o default'
-            phpcq_install: 'update'
-          - php: 8.0
-            output: '-o github-action -o default'
-            phpcq_install: 'update'
           - php: 8.1
             output: '-o github-action -o default'
             phpcq_install: 'update'