build(deps): bump govuk_web_banners from 1.21.0 to 1.21.1

Bumps [govuk_web_banners](https://github.com/alphagov/govuk_web_banners) from 1.21.0 to 1.21.1.
- [Changelog](https://github.com/alphagov/govuk_web_banners/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_web_banners@v1.21.0...v1.21.1)

---
updated-dependencies:
- dependency-name: govuk_web_banners
  dependency-version: 1.21.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -200,7 +200,7 @@ GEM
       capybara (>= 3.36)
       puma
       selenium-webdriver (>= 4.0)
-    govuk_web_banners (1.21.0)
+    govuk_web_banners (1.21.1)
       govuk_app_config (>= 9)
       govuk_publishing_components
       rails (>= 7)
@@ -543,7 +543,7 @@ GEM
     redis-client (0.26.1)
       connection_pool
     regexp_parser (2.11.2)
-    reline (0.6.2)
+    reline (0.6.3)
       io-console (~> 0.5)
     request_store (1.7.0)
       rack (>= 1.4)