Bump rubocop from 1.28.2 to 1.29.0 in /dependencies (#2884)

Bumps [rubocop](https://github.com/rubocop/rubocop) from 1.28.2 to 1.29.0.
- [Release notes](https://github.com/rubocop/rubocop/releases)
- [Changelog](https://github.com/rubocop/rubocop/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop/compare/v1.28.2...v1.29.0)

---
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>

dependencies/Gemfile

@@ -4,7 +4,7 @@ source "https://rubygems.org"
 
 git_source(:github) { |repo_name| "https://github.com/#{repo_name}" }
 
-gem "rubocop", "~> 1.28.2"
+gem "rubocop", "~> 1.29.0"
 gem "rubocop-github", "~> 0.17.0"
 gem "rubocop-performance", "~>1.13.3"
 gem "rubocop-rails", "~> 2.14"

dependencies/Gemfile.lock

@@ -18,12 +18,12 @@ GEM
     rainbow (3.1.1)
     regexp_parser (2.3.1)
     rexml (3.2.5)
-    rubocop (1.28.2)
+    rubocop (1.29.0)
       parallel (~> 1.10)
       parser (>= 3.1.0.0)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
-      rexml
+      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)
@@ -51,7 +51,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  rubocop (~> 1.28.2)
+  rubocop (~> 1.29.0)
   rubocop-github (~> 0.17.0)
   rubocop-performance (~> 1.13.3)
   rubocop-rails (~> 2.14)