build(deps): bump test-room-7/action-update-file from 1.8.0 to 2.0.0

Bumps [test-room-7/action-update-file](https://github.com/test-room-7/action-update-file) from 1.8.0 to 2.0.0.
- [Release notes](https://github.com/test-room-7/action-update-file/releases)
- [Commits](test-room-7/action-update-file@v1.8.0...v2.0.0)

---
updated-dependencies:
- dependency-name: test-room-7/action-update-file
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/automation.yml

@@ -14,7 +14,7 @@ jobs:
       - run: |
           nix run .#test
           nix run .#readme > README.md
-      - uses: test-room-7/action-update-file@v1.8.0
+      - uses: test-room-7/action-update-file@v2.0.0
         with:
           branch: ${{ github.head_ref || github.ref_name }}
           file-path: |