Bump grover from 1.1.7 to 1.1.9 (#1262)

Bumps [grover](https://github.com/Studiosity/grover) from 1.1.7 to 1.1.9.
- [Release notes](https://github.com/Studiosity/grover/releases)
- [Changelog](https://github.com/Studiosity/grover/blob/main/CHANGELOG.md)
- [Commits](Studiosity/grover@v1.1.7...v1.1.9)

---
updated-dependencies:
- dependency-name: grover
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Gemfile.lock

@@ -258,7 +258,7 @@ GEM
     govuk_notify_rails (2.2.0)
       notifications-ruby-client (~> 5.1)
       rails (>= 4.1.0)
-    grover (1.1.7)
+    grover (1.1.9)
       combine_pdf (~> 1.0)
       nokogiri (~> 1.0)
     hashie (5.0.0)