Bump rubocop from 1.28.2 to 1.50.2

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.28.2 to 1.50.2.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.28.2...v1.50.2)

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

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

Gemfile.lock

@@ -13,9 +13,11 @@ GEM
     connection_pool (2.4.1)
     hiredis (0.6.3)
     hiredis (0.6.3-java)
+    json (2.7.1)
+    json (2.7.1-java)
     minitest (5.21.2)
-    parallel (1.22.1)
-    parser (3.3.0.4)
+    parallel (1.24.0)
+    parser (3.3.0.5)
       ast (~> 2.4.1)
       racc
     racc (1.7.3)
@@ -25,25 +27,26 @@ GEM
     rake-compiler (1.2.5)
       rake
     redis (4.6.0)
-    regexp_parser (2.5.0)
-    rexml (3.2.5)
-    rubocop (1.28.2)
+    regexp_parser (2.9.0)
+    rexml (3.2.6)
+    rubocop (1.50.2)
+      json (~> 2.3)
       parallel (~> 1.10)
-      parser (>= 3.1.0.0)
+      parser (>= 3.2.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.17.0, < 2.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.28.0, < 2.0)
       ruby-progressbar (~> 1.7)
-      unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.17.0)
-      parser (>= 3.1.1.0)
+      unicode-display_width (>= 2.4.0, < 3.0)
+    rubocop-ast (1.30.0)
+      parser (>= 3.2.1.0)
     rubocop-minitest (0.19.1)
       rubocop (>= 0.90, < 2.0)
-    ruby-progressbar (1.11.0)
+    ruby-progressbar (1.13.0)
     stackprof (0.2.26)
     toxiproxy (2.0.2)
-    unicode-display_width (2.2.0)
+    unicode-display_width (2.5.0)
 
 PLATFORMS
   ruby