Bump govuk_app_config from 6.0.1 to 7.0.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 6.0.1 to 7.0.0.
- [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@v6.0.1...v7.0.0)

---
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

@@ -124,7 +124,7 @@ GEM
     globalid (1.1.0)
       activesupport (>= 5.0)
     govuk_ab_testing (2.4.3)
-    govuk_app_config (6.0.1)
+    govuk_app_config (7.0.0)
       logstasher (~> 2.1)
       plek (>= 4, < 6)
       prometheus_exporter (~> 2.0)
@@ -133,7 +133,6 @@ GEM
       sentry-rails (~> 5.3)
       sentry-ruby (~> 5.3)
       statsd-ruby (~> 1.5)
-      unicorn (~> 6.1)
     govuk_personalisation (0.13.0)
       plek (>= 1.9.0)
       rails (>= 6, < 8)
@@ -175,7 +174,6 @@ GEM
     json (2.6.3)
     json-schema (3.0.0)
       addressable (>= 2.8)
-    kgio (2.11.4)
     kramdown (2.4.0)
       rexml
     link_header (0.0.8)
@@ -279,7 +277,6 @@ GEM
       thor (~> 1.0)
       zeitwerk (~> 2.5)
     rainbow (3.1.1)
-    raindrops (0.20.1)
     rake (13.0.6)
     regexp_parser (2.7.0)
     request_store (1.5.1)
@@ -379,9 +376,6 @@ GEM
       unf_ext
     unf_ext (0.0.8.2)
     unicode-display_width (2.4.2)
-    unicorn (6.1.0)
-      kgio (~> 2.6)
-      raindrops (~> 0.7)
     webmock (3.18.1)
       addressable (>= 2.8.0)
       crack (>= 0.3.2)