Bump rubocop from 1.50.2 to 1.51.0

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.50.2 to 1.51.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.50.2...v1.51.0)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -11,15 +11,15 @@ GEM
     docile (1.4.0)
     json (2.6.3)
     minitest (5.18.0)
-    parallel (1.22.1)
-    parser (3.2.2.0)
+    parallel (1.23.0)
+    parser (3.2.2.1)
       ast (~> 2.4.1)
     prettier_print (1.2.1)
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.8.0)
     rexml (3.2.5)
-    rubocop (1.50.2)
+    rubocop (1.51.0)
       json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.2.0.0)
@@ -29,7 +29,7 @@ GEM
       rubocop-ast (>= 1.28.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.28.0)
+    rubocop-ast (1.28.1)
       parser (>= 3.2.1.0)
     ruby-progressbar (1.13.0)
     simplecov (0.22.0)