build(deps): bump govuk_app_config from 9.17.6 to 9.17.7

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 9.17.6 to 9.17.7.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v9.17.6...v9.17.7)

---
updated-dependencies:
- dependency-name: govuk_app_config
  dependency-version: 9.17.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -167,7 +167,7 @@ GEM
     googleapis-common-protos-types (1.20.0)
       google-protobuf (>= 3.18, < 5.a)
     govuk_ab_testing (3.0.0)
-    govuk_app_config (9.17.6)
+    govuk_app_config (9.17.7)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (>= 0.25, < 0.31)
       opentelemetry-instrumentation-all (>= 0.39.1, < 0.77.0)