Bump govuk_app_config from 9.15.3 to 9.15.4

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 9.15.3 to 9.15.4.
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v9.15.3...v9.15.4)

---
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

@@ -162,7 +162,7 @@ GEM
       rake (>= 13)
     googleapis-common-protos-types (1.16.0)
       google-protobuf (>= 3.18, < 5.a)
-    govuk_app_config (9.15.3)
+    govuk_app_config (9.15.4)
       logstasher (~> 2.1)
       opentelemetry-exporter-otlp (>= 0.25, < 0.30)
       opentelemetry-instrumentation-all (>= 0.39.1, < 0.70.0)
@@ -191,7 +191,7 @@ GEM
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
     inflection (1.0.0)
-    io-console (0.7.2)
+    io-console (0.8.0)
     irb (1.14.1)
       rdoc (>= 4.0.0)
       reline (>= 0.4.2)
@@ -218,7 +218,7 @@ GEM
     listen (3.9.0)
       rb-fsevent (~> 0.10, >= 0.10.3)
       rb-inotify (~> 0.9, >= 0.9.10)
-    logger (1.6.1)
+    logger (1.6.2)
     logstasher (2.1.5)
       activesupport (>= 5.2)
       request_store
@@ -245,7 +245,7 @@ GEM
     mime-types-data (3.2024.1105)
     mini_mime (1.1.5)
     mini_portile2 (2.8.8)
-    minitest (5.25.2)
+    minitest (5.25.3)
     mlanett-redis-lock (0.2.7)
       redis
     msgpack (1.7.2)
@@ -535,7 +535,8 @@ GEM
     pry-byebug (3.10.1)
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
-    psych (5.2.0)
+    psych (5.2.1)
+      date
       stringio
     public_suffix (6.0.1)
     puma (6.5.0)
@@ -595,7 +596,7 @@ GEM
     redis-client (0.22.2)
       connection_pool
     regexp_parser (2.9.3)
-    reline (0.5.11)
+    reline (0.5.12)
       io-console (~> 0.5)
     request_store (1.7.0)
       rack (>= 1.4)
@@ -659,7 +660,7 @@ GEM
     rubocop-rspec (3.2.0)
       rubocop (~> 1.61)
     ruby-progressbar (1.13.0)
-    securerandom (0.3.2)
+    securerandom (0.4.0)
     sentry-rails (5.21.0)
       railties (>= 5.0)
       sentry-ruby (~> 5.21.0)
@@ -717,7 +718,7 @@ GEM
       addressable (>= 2.8.0)
       crack (>= 0.3.2)
       hashdiff (>= 0.4.0, < 2.0.0)
-    webrick (1.9.0)
+    webrick (1.9.1)
     websocket-driver (0.7.6)
       websocket-extensions (>= 0.1.0)
     websocket-extensions (0.1.5)