Bump govuk_frontend_toolkit from 7.5.0 to 7.6.0

Bumps [govuk_frontend_toolkit](https://github.com/alphagov/govuk_frontend_toolkit) from 7.5.0 to 7.6.0.
- [Release notes](https://github.com/alphagov/govuk_frontend_toolkit/releases)
- [Changelog](https://github.com/alphagov/govuk_frontend_toolkit/blob/master/CHANGELOG.md)
- [Commits](alphagov/govuk_frontend_toolkit@v7.5.0...v7.6.0)

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

Gemfile

@@ -16,7 +16,7 @@ gem 'uglifier', '>= 1.3.0'
 gem 'gds-api-adapters', '~> 52.6'
 gem 'govuk_ab_testing', '~> 2.4'
 gem 'govuk_app_config', '~> 1.6'
-gem 'govuk_frontend_toolkit', '~> 7.4'
+gem 'govuk_frontend_toolkit', '~> 7.6'
 gem 'govuk_publishing_components', '~> 9.5.3'
 gem 'plek', '~> 2.1'
 gem 'slimmer', '~> 13.0'

Gemfile.lock

@@ -123,7 +123,7 @@ GEM
       sentry-raven (~> 2.7.1)
       statsd-ruby (~> 1.4.0)
       unicorn (~> 5.4.0)
-    govuk_frontend_toolkit (7.5.0)
+    govuk_frontend_toolkit (7.6.0)
       railties (>= 3.1.0)
       sass (>= 3.2.0)
     govuk_publishing_components (9.5.3)
@@ -279,7 +279,7 @@ GEM
       crass (~> 1.0.2)
       nokogiri (>= 1.4.4)
       nokogumbo (~> 1.4)
-    sass (3.5.6)
+    sass (3.5.7)
       sass-listen (~> 4.0.0)
     sass-listen (4.0.0)
       rb-fsevent (~> 0.9, >= 0.9.4)
@@ -364,7 +364,7 @@ DEPENDENCIES
   govuk-lint
   govuk_ab_testing (~> 2.4)
   govuk_app_config (~> 1.6)
-  govuk_frontend_toolkit (~> 7.4)
+  govuk_frontend_toolkit (~> 7.6)
   govuk_publishing_components (~> 9.5.3)
   govuk_schemas (~> 3.1)
   htmlentities (~> 4.3)