Bump rubocop-govuk from 5.1.19 to 5.1.20

Dependabot couldn't find the original pull request head commit, 5c5581c.

Author: dependabot[bot]

Gemfile.lock

@@ -778,14 +778,14 @@ GEM
     rubocop-capybara (2.22.1)
       lint_roller (~> 1.1)
       rubocop (~> 1.72, >= 1.72.1)
-    rubocop-govuk (5.1.19)
+    rubocop-govuk (5.1.20)
       rubocop (= 1.79.2)
       rubocop-ast (= 1.46.0)
       rubocop-capybara (= 2.22.1)
-      rubocop-rails (= 2.32.0)
+      rubocop-rails (= 2.33.3)
       rubocop-rake (= 0.7.1)
       rubocop-rspec (= 3.6.0)
-    rubocop-rails (2.32.0)
+    rubocop-rails (2.33.3)
       activesupport (>= 4.2.0)
       lint_roller (~> 1.1)
       rack (>= 1.1)
@@ -873,7 +873,7 @@ GEM
     transitions (1.3.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
-    unicode-display_width (3.1.4)
+    unicode-display_width (3.1.5)
       unicode-emoji (~> 4.0, >= 4.0.4)
     unicode-emoji (4.0.4)
     uri (1.0.3)