Bump the github-actions group with 1 update (WordPress#59174)

Bumps the github-actions group with 1 update: [tj-actions/changed-files](https://github.com/tj-actions/changed-files).


Updates `tj-actions/changed-files` from 42.0.2 to 42.0.4
- [Release notes](https://github.com/tj-actions/changed-files/releases)
- [Changelog](https://github.com/tj-actions/changed-files/blob/main/HISTORY.md)
- [Commits](tj-actions/changed-files@90a06d6...3f54ebb)

---
updated-dependencies:
- dependency-name: tj-actions/changed-files
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: desrosj <[email protected]>

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

@@ -17,7 +17,7 @@ jobs:
 
             - name: Get changed PHP files
               id: changed-files-php
-              uses: tj-actions/changed-files@90a06d6ba9543371ab4df8eeca0be07ca6054959 # v42.0.2
+              uses: tj-actions/changed-files@3f54ebb830831fc121d3263c1857cfbdc310cdb9 # v42.0.4
               with:
                   files: |
                       *.{php}