Bump govuk_frontend_toolkit from 8.2.0 to 9.0.1

Bumps [govuk_frontend_toolkit](https://github.com/alphagov/govuk_frontend_toolkit) from 8.2.0 to 9.0.1.
- [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@v8.2.0...v9.0.1)

---
updated-dependencies:
- dependency-name: govuk_frontend_toolkit
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -147,7 +147,7 @@ GEM
     faraday-net_http_persistent (1.2.0)
     faraday-patron (1.0.0)
     ffaker (2.18.0)
-    ffi (1.11.1)
+    ffi (1.15.3)
     formatador (0.2.5)
     geckodriver-helper (0.20.2)
       archive-zip (~> 0.7)
@@ -157,9 +157,8 @@ GEM
       govuk_frontend_toolkit (>= 6.0.2)
       rails (>= 4.1.0)
       sass (>= 3.2.0)
-    govuk_frontend_toolkit (8.2.0)
+    govuk_frontend_toolkit (9.0.1)
       railties (>= 3.1.0)
-      sass (>= 3.2.0)
     govuk_template (0.26.0)
       rails (>= 3.1)
     guard (2.17.0)
@@ -318,8 +317,8 @@ GEM
       thor (>= 0.19.0, < 2.0)
     rainbow (3.0.0)
     rake (13.0.6)
-    rb-fsevent (0.10.3)
-    rb-inotify (0.10.0)
+    rb-fsevent (0.11.0)
+    rb-inotify (0.10.1)
       ffi (~> 1.0)
     redis (4.2.5)
     regexp_parser (2.1.1)