Bump govuk_app_config from 5.0.0 to 5.1.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 5.0.0 to 5.1.0.
- [Release notes](https://github.com/alphagov/govuk_app_config/releases)
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v5.0.0...v5.1.0)

---
updated-dependencies:
- dependency-name: govuk_app_config
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -124,7 +124,7 @@ GEM
     globalid (1.1.0)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (5.0.0)
+    govuk_app_config (5.1.0)
       logstasher (~> 2.1)
       plek (>= 4, < 6)
       prometheus_exporter (~> 2.0)
@@ -218,7 +218,7 @@ GEM
       net-protocol
     netrc (0.11.0)
     nio4r (2.5.8)
-    nokogiri (1.14.1)
+    nokogiri (1.14.2)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     null_logger (0.0.1)