Bump tj-actions/changed-files from 44.5.5 to 44.5.7 in the actions group

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


Updates `tj-actions/changed-files` from 44.5.5 to 44.5.7
- [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@v44.5.5...v44.5.7)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/reject-staging-changes.yml

@@ -16,7 +16,7 @@ jobs:
 
       - name: Get modified files in the staging directory
         id: modified-files-in-staging
-        uses: tj-actions/[email protected].5
+        uses: tj-actions/[email protected].7
         with:
           # only checks for modified files in this directory
           files: jupyterlab/staging