Bump rubocop from 1.48.1 to 1.50.1

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.48.1 to 1.50.1.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.48.1...v1.50.1)

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

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

Gemfile.lock

@@ -172,7 +172,7 @@ GEM
       racc (~> 1.4)
     optparse (0.3.1)
     parallel (1.22.1)
-    parser (3.2.1.1)
+    parser (3.2.2.0)
       ast (~> 2.4.1)
     pg (1.4.6)
     power_assert (2.0.3)
@@ -210,17 +210,17 @@ GEM
     ricecream (0.2.1)
     rss (0.2.9)
       rexml
-    rubocop (1.48.1)
+    rubocop (1.50.1)
       json (~> 2.3)
       parallel (~> 1.10)
       parser (>= 3.2.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.26.0, < 2.0)
+      rubocop-ast (>= 1.28.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
-    rubocop-ast (1.27.0)
+    rubocop-ast (1.28.0)
       parser (>= 3.2.1.0)
     rubocop-minitest (0.29.0)
       rubocop (>= 1.39, < 2.0)