Bump govuk_app_config from 8.1.1 to 9.0.3

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 8.1.1 to 9.0.3.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v8.1.1...v9.0.3)

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

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

Gemfile.lock

@@ -173,7 +173,7 @@ GEM
       google-apis-core (>= 0.4, < 2.a)
       google-apis-discovery_v1 (~> 0.5)
       thor (>= 0.20, < 2.a)
-    google-protobuf (3.23.3)
+    google-protobuf (3.23.4)
     googleapis-common-protos-types (1.6.0)
       google-protobuf (~> 3.14)
     googleauth (1.1.2)
@@ -183,7 +183,7 @@ GEM
       multi_json (~> 1.11)
       os (>= 0.9, < 2.0)
       signet (>= 0.16, < 2.a)
-    govuk_app_config (8.1.1)
+    govuk_app_config (9.0.3)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (~> 0.25.0)
       opentelemetry-instrumentation-all (~> 0.39.1)