Bump govuk_app_config from 9.8.2 to 9.9.1

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 9.8.2 to 9.9.1.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v9.8.2...v9.9.1)

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

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

Gemfile.lock

@@ -158,9 +158,9 @@ GEM
     google-protobuf (3.25.2-aarch64-linux)
     google-protobuf (3.25.2-arm64-darwin)
     google-protobuf (3.25.2-x86_64-linux)
-    googleapis-common-protos-types (1.11.0)
+    googleapis-common-protos-types (1.12.0)
       google-protobuf (~> 3.18)
-    govuk_app_config (9.8.2)
+    govuk_app_config (9.9.1)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (>= 0.25, < 0.27)
       opentelemetry-instrumentation-all (>= 0.39.1, < 0.57.0)