Add a few more PHP versions.

Author: desrosj

.github/workflows/phpunit-tests.yml

@@ -167,7 +167,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        php: [ '8.4' ]
+        php: [ '7.2', '7.4', '8.0', '8.4' ]
         db-version: [ '8.4' ]
         phpunit-test-groups: [ 'html-api-html5lib-tests' ]