Bump rubocop from 0.52.1 to 0.54.0

Bumps [rubocop](https://github.com/bbatsov/rubocop) from 0.52.1 to 0.54.0.
- [Release notes](https://github.com/bbatsov/rubocop/releases)
- [Changelog](https://github.com/bbatsov/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v0.52.1...v0.54.0)

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

Gemfile.lock

@@ -15,8 +15,8 @@ GEM
       bindata (~> 2)
     json (2.1.0)
     parallel (1.12.1)
-    parser (2.4.0.2)
-      ast (~> 2.3)
+    parser (2.5.0.4)
+      ast (~> 2.4.0)
     powerpack (0.1.1)
     rainbow (3.0.0)
     rake (12.3.0)
@@ -33,9 +33,9 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.7.0)
     rspec-support (3.7.0)
-    rubocop (0.52.1)
+    rubocop (0.54.0)
       parallel (~> 1.10)
-      parser (>= 2.4.0.2, < 3.0)
+      parser (>= 2.5)
       powerpack (~> 0.1)
       rainbow (>= 2.2.2, < 4.0)
       ruby-progressbar (~> 1.7)