Bump tj-actions/verify-changed-files from 19 to 20 (#62)

Bumps [tj-actions/verify-changed-files](https://github.com/tj-actions/verify-changed-files) from 19 to 20.
- [Release notes](https://github.com/tj-actions/verify-changed-files/releases)
- [Changelog](https://github.com/tj-actions/verify-changed-files/blob/main/HISTORY.md)
- [Commits](tj-actions/verify-changed-files@v19...v20)

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

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

.github/workflows/check-new-version.yml

@@ -27,7 +27,7 @@ jobs:
           sed -i "s/ENV FIREFLY_VERSION=.*/ENV FIREFLY_VERSION=${{ steps.check_version.outputs.new_version }}/" firefly-iii/Dockerfile
 
       - name: Check if Dockerfile has changed
-        uses: tj-actions/verify-changed-files@v19
+        uses: tj-actions/verify-changed-files@v20
         id: verify_changed_files
         with:
           files: |