Bump rubocop-rails from 2.26.2 to 2.29.1

Note we aren't updating concurrent-ruby (which Dependabot would have
updated) due to an incompatibility with Rails 7.0.

Bumps [rubocop-rails](https://github.com/rubocop/rubocop-rails) from 2.26.2 to 2.29.1.
- [Release notes](https://github.com/rubocop/rubocop-rails/releases)
- [Changelog](https://github.com/rubocop/rubocop-rails/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rubocop/rubocop-rails/compare/v2.26.2...v2.29.1)

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

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

Gemfile.lock

@@ -572,7 +572,7 @@ GEM
     rubocop-performance (1.23.1)
       rubocop (>= 1.48.1, < 2.0)
       rubocop-ast (>= 1.31.1, < 2.0)
-    rubocop-rails (2.26.2)
+    rubocop-rails (2.29.1)
       activesupport (>= 4.2.0)
       rack (>= 1.1)
       rubocop (>= 1.52.0, < 2.0)
@@ -790,7 +790,7 @@ DEPENDENCIES
   rubocop-capybara (~> 2.21.0)
   rubocop-factory_bot (~> 2.26.1)
   rubocop-performance (~> 1.23.1)
-  rubocop-rails (~> 2.26.2)
+  rubocop-rails (~> 2.29.1)
   rubocop-rspec (~> 3.1.0)
   rubocop-rspec_rails (~> 2.30.0)
   rvm1-capistrano3 (~> 1.4.0)