Bump govuk_app_config from 4.3.0 to 4.4.2

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 4.3.0 to 4.4.2.
- [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@v4.3.0...v4.4.2)

---
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

@@ -110,8 +110,9 @@ GEM
     globalid (1.0.0)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (4.3.0)
+    govuk_app_config (4.4.2)
       logstasher (>= 1.2.2, < 2.2.0)
+      prometheus_exporter (~> 2.0.2)
       puma (~> 5.0)
       sentry-rails (~> 4.5.0)
       sentry-ruby (~> 4.5.0)
@@ -204,6 +205,8 @@ GEM
       ast (~> 2.4.1)
     phantomjs (2.1.1.0)
     plek (4.0.0)
+    prometheus_exporter (2.0.2)
+      webrick
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
@@ -360,6 +363,7 @@ GEM
       addressable (>= 2.3.6)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
+    webrick (1.7.0)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)