Bump rubocop-govuk from 3.3.0 to 3.3.1

Bumps [rubocop-govuk](https://github.com/alphagov/rubocop-govuk) from 3.3.0 to 3.3.1.
- [Release notes](https://github.com/alphagov/rubocop-govuk/releases)
- [Changelog](https://github.com/alphagov/rubocop-govuk/blob/master/CHANGELOG.md)
- [Commits](alphagov/rubocop-govuk@v3.3.0...v3.3.1)

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

Author: dependabot-preview[bot]

Gemfile.lock

@@ -257,7 +257,7 @@ GEM
       rexml
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 1.7)
-    rubocop-govuk (3.3.0)
+    rubocop-govuk (3.3.1)
       rubocop (= 0.80.1)
       rubocop-rails (~> 2)
       rubocop-rspec (~> 1.28)