Bump govuk_app_config from 3.1.0 to 3.1.1

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 3.1.0 to 3.1.1.
- [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@v3.1.0...v3.1.1)

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

Author: dependabot[bot]

Gemfile.lock

@@ -99,12 +99,16 @@ GEM
     execjs (2.7.0)
     faker (2.13.0)
       i18n (>= 1.6, < 2)
-    faraday (1.4.1)
+    faraday (1.4.2)
+      faraday-em_http (~> 1.0)
+      faraday-em_synchrony (~> 1.0)
       faraday-excon (~> 1.1)
       faraday-net_http (~> 1.0)
       faraday-net_http_persistent (~> 1.1)
       multipart-post (>= 1.2, < 3)
       ruby2_keywords (>= 0.0.4)
+    faraday-em_http (1.0.0)
+    faraday-em_synchrony (1.0.0)
     faraday-excon (1.1.0)
     faraday-net_http (1.0.1)
     faraday-net_http_persistent (1.1.0)
@@ -118,7 +122,7 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (3.1.0)
+    govuk_app_config (3.1.1)
       logstasher (>= 1.2.2, < 2.2.0)
       sentry-raven (~> 3.1.1)
       statsd-ruby (~> 1.5.0)