Bump rubocop from 1.26.1 to 1.29.1 (#11124)

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.26.1 to 1.29.1.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](rubocop/rubocop@v1.26.1...v1.29.1)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile

@@ -53,7 +53,7 @@ gem 'rdiscount', '~> 2.2'
 gem 'react-rails'
 gem "recaptcha", require: "recaptcha/rails"
 gem 'responders', '~> 3.0'
-gem 'rubocop', '~> 1.26.1', require: false
+gem 'rubocop', '~> 1.29.1', require: false
 gem "ruby-openid", :require => "openid"
 gem 'sanitize'
 gem 'sentry-ruby'

Gemfile.lock

@@ -408,8 +408,8 @@ GEM
       mime-types
       mimemagic (~> 0.3.0)
       terrapin (~> 0.6.0)
-    parallel (1.22.0)
-    parser (3.1.1.0)
+    parallel (1.22.1)
+    parser (3.1.2.0)
       ast (~> 2.4.1)
     passenger (6.0.13)
       rack
@@ -492,7 +492,7 @@ GEM
     redis (4.6.0)
     redis-namespace (1.8.2)
       redis (>= 3.0.4)
-    regexp_parser (2.2.1)
+    regexp_parser (2.4.0)
     representable (3.1.1)
       declarative (< 0.1.0)
       trailblazer-option (>= 0.1.1, < 0.2.0)
@@ -530,16 +530,16 @@ GEM
       diff-lcs (>= 1.2.0, < 2.0)
       rspec-support (~> 3.11.0)
     rspec-support (3.11.0)
-    rubocop (1.26.1)
+    rubocop (1.29.1)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
-      rubocop-ast (>= 1.16.0, < 2.0)
+      rexml (>= 3.2.5, < 4.0)
+      rubocop-ast (>= 1.17.0, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 1.4.0, < 3.0)
-    rubocop-ast (1.16.0)
+    rubocop-ast (1.17.0)
       parser (>= 3.1.1.0)
     rubocop-performance (1.13.3)
       rubocop (>= 1.7.0, < 2.0)
@@ -770,7 +770,7 @@ DEPENDENCIES
   rest-client
   reverse_markdown
   rspec
-  rubocop (~> 1.26.1)
+  rubocop (~> 1.29.1)
   rubocop-performance
   rubocop-rails
   rubocop-rake