Add rubocop-rspec_rails to channel/rubocop-1-56-3

[fonji]

Rubocop-rspec has extracted the rails cops to rubocop-rspec_rails

the cops related to rspec-rails are aliased (RSpec/Rails/Foo == RSpecRails/Foo) until v3.0 is released

https://github.com/rubocop/rubocop-rspec/blob/master/CHANGELOG.md#2280-2024-03-30

So it would be nice to support it before v3 is released

[fonji]

~~I feel like I should add it to beta also~~ done

[breiko83]

Any plans on merging this? Having a hard time with this issue: RSpecRails/HaveHttpStatus has the wrong namespace