Bump rubocop-govuk from 4.5.0 to 4.6.0

Bumps [rubocop-govuk](https://github.com/alphagov/rubocop-govuk) from 4.5.0 to 4.6.0.
- [Release notes](https://github.com/alphagov/rubocop-govuk/releases)
- [Changelog](https://github.com/alphagov/rubocop-govuk/blob/main/CHANGELOG.md)
- [Commits](alphagov/rubocop-govuk@v4.5.0...v4.6.0)

---
updated-dependencies:
- dependency-name: rubocop-govuk
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -288,7 +288,8 @@ GEM
       netrc (~> 0.8)
     rexml (3.2.5)
     rouge (3.29.0)
-    rubocop (1.30.1)
+    rubocop (1.31.2)
+      json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
@@ -297,22 +298,22 @@ GEM
       rubocop-ast (>= 1.18.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.18.0)
+    rubocop-ast (1.19.1)
       parser (>= 3.1.1.0)
-    rubocop-govuk (4.5.0)
-      rubocop (= 1.30.1)
-      rubocop-ast (= 1.18.0)
-      rubocop-rails (= 2.14.2)
+    rubocop-govuk (4.6.0)
+      rubocop (= 1.31.2)
+      rubocop-ast (= 1.19.1)
+      rubocop-rails (= 2.15.2)
       rubocop-rake (= 0.6.0)
-      rubocop-rspec (= 2.11.1)
-    rubocop-rails (2.14.2)
+      rubocop-rspec (= 2.12.1)
+    rubocop-rails (2.15.2)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.7.0, < 2.0)
     rubocop-rake (0.6.0)
       rubocop (~> 1.0)
-    rubocop-rspec (2.11.1)
-      rubocop (~> 1.19)
+    rubocop-rspec (2.12.1)
+      rubocop (~> 1.31)
     ruby-progressbar (1.11.0)
     rubyzip (2.3.2)
     sassc (2.4.0)
@@ -366,7 +367,7 @@ GEM
     tilt (2.0.10)
     timecop (0.9.5)
     timeout (0.3.0)
-    tzinfo (2.0.4)
+    tzinfo (2.0.5)
       concurrent-ruby (~> 1.0)
     uglifier (4.2.0)
       execjs (>= 0.3.0, < 3)