GitHub Actions: Fix PHP file change detection filter pattern (#61183)

* GitHub Actions: Fix PHP file change detection filter pattern

* Temporarily update PHP files

* Revert temporary changes

* enclose the pattern in quotes

Co-authored-by: Brian Alexander <824344+ironprogrammer@users.noreply.github.com>

* Updated some files to test GitHub action

* Remove quotes

* Undo unwanted changes

* Change detection filter pattern

* Add spaces

---------

Co-authored-by: t-hamano <wildworks@git.wordpress.org>
Co-authored-by: ironprogrammer <ironprogrammer@git.wordpress.org>

.github/workflows/php-changes-detection.yml

@@ -20,7 +20,9 @@ jobs:
               uses: tj-actions/changed-files@0874344d6ebbaa00a27da73276ae7162fadcaf69 # v44.3.0
               with:
                   files: |
-                      **.{php}
+                      lib/**
+                      packages/**/*.php
+                      phpunit/**
 
             - name: List all changed files
               if: steps.changed-files-php.outputs.any_changed == 'true'