Bump govuk_app_config from 4.6.2 to 4.6.3

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 4.6.2 to 4.6.3.
- [Release notes](https://github.com/alphagov/govuk_app_config/releases)
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v4.6.2...v4.6.3)

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

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

Gemfile.lock

@@ -115,7 +115,7 @@ GEM
     globalid (1.0.0)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (4.6.2)
+    govuk_app_config (4.6.3)
       logstasher (~> 2.1)
       prometheus_exporter (~> 2.0)
       puma (~> 5.6)
@@ -193,7 +193,7 @@ GEM
     mime-types-data (3.2022.0105)
     mini_mime (1.1.2)
     mini_portile2 (2.8.0)
-    minitest (5.16.0)
+    minitest (5.16.1)
     minitest-reporters (1.4.2)
       ansi
       builder
@@ -221,8 +221,8 @@ GEM
       nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3.1)
-    rack-test (1.1.0)
-      rack (>= 1.0, < 3)
+    rack-test (2.0.1)
+      rack (>= 1.3)
     rack_strip_client_ip (0.0.2)
     rails (6.1.6)
       actioncable (= 6.1.6)