bbatsov/rubocop

### Bug fixes

* [#12871](https://github.com/rubocop/rubocop/pull/12871): Fix an error for `rubocop -V` when `.rubocop.yml` contains ERB. ([@earlopain][])
* [#12862](https://github.com/rubocop/rubocop/issues/12862): Fix a false positive for `Style/RedundantLineContinuation` when line continuations involve `return` with a return value. ([@koic][])
* [#12664](https://github.com/rubocop/rubocop/pull/12664): Fix handling of `textDocument/diagnostic`. ([@muxcmux][])
* [#12865](https://github.com/rubocop/rubocop/issues/12865): Fix Rails Cops, which weren't reporting any violations unless running with `bundle exec`. ([@amomchilov][])

[@earlopain]: https://github.com/earlopain
[@koic]: https://github.com/koic
[@muxcmux]: https://github.com/muxcmux
[@amomchilov]: https://github.com/amomchilov