Bump govuk_app_config from 8.1.1 to 9.0.1

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 8.1.1 to 9.0.1.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v8.1.1...v9.0.1)

---
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

@@ -187,7 +187,7 @@ GEM
       jquery-rails (~> 4.3)
       plek (>= 2.1)
       rails (>= 6)
-    govuk_app_config (8.1.1)
+    govuk_app_config (9.0.1)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (~> 0.25.0)
       opentelemetry-instrumentation-all (~> 0.39.1)
@@ -288,14 +288,14 @@ GEM
       net-protocol
     netrc (0.11.0)
     nio4r (2.5.9)
-    nokogiri (1.15.2)
+    nokogiri (1.15.3)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
-    nokogiri (1.15.2-aarch64-linux)
+    nokogiri (1.15.3-aarch64-linux)
       racc (~> 1.4)
-    nokogiri (1.15.2-arm64-darwin)
+    nokogiri (1.15.3-arm64-darwin)
       racc (~> 1.4)
-    nokogiri (1.15.2-x86_64-linux)
+    nokogiri (1.15.3-x86_64-linux)
       racc (~> 1.4)
     null_logger (0.0.1)
     oauth2 (2.0.9)