Bump govuk_app_config from 4.13.0 to 5.0.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 4.13.0 to 5.0.0.
- [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@v4.13.0...v5.0.0)

---
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

@@ -99,7 +99,7 @@ GEM
     childprocess (4.1.0)
     climate_control (1.2.0)
     coderay (1.1.3)
-    concurrent-ruby (1.1.10)
+    concurrent-ruby (1.2.0)
     crack (0.4.5)
       rexml
     crass (1.0.6)
@@ -124,7 +124,7 @@ GEM
     globalid (1.0.1)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (4.13.0)
+    govuk_app_config (5.0.0)
       logstasher (~> 2.1)
       plek (>= 4, < 6)
       prometheus_exporter (~> 2.0)
@@ -226,7 +226,7 @@ GEM
     parser (3.1.3.0)
       ast (~> 2.4.1)
     plek (5.0.0)
-    prometheus_exporter (2.0.7)
+    prometheus_exporter (2.0.8)
       webrick
     pry (0.14.2)
       coderay (~> 1.1)
@@ -236,7 +236,7 @@ GEM
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.2)
-    rack-proxy (0.7.4)
+    rack-proxy (0.7.6)
       rack
     rack-test (2.0.2)
       rack (>= 1.3)
@@ -261,7 +261,7 @@ GEM
     rails-dom-testing (2.0.3)
       activesupport (>= 4.2.0)
       nokogiri (>= 1.6)
-    rails-html-sanitizer (1.4.4)
+    rails-html-sanitizer (1.5.0)
       loofah (~> 2.19, >= 2.19.1)
     rails-i18n (7.0.6)
       i18n (>= 0.7, < 2)
@@ -383,7 +383,7 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webrick (1.7.0)
+    webrick (1.8.0)
     websocket (1.2.9)
     websocket-driver (0.7.5)
       websocket-extensions (>= 0.1.0)