Bump govuk_app_config from 9.0.3 to 9.0.4

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 9.0.3 to 9.0.4.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v9.0.3...v9.0.4)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -179,7 +179,7 @@ GEM
       jquery-rails (~> 4.3)
       plek (>= 2.1)
       rails (>= 6)
-    govuk_app_config (9.0.3)
+    govuk_app_config (9.0.4)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (~> 0.25.0)
       opentelemetry-instrumentation-all (~> 0.39.1)