bbatsov/rubocop

### Bug fixes

* [#5968](https://github.com/rubocop/rubocop/issues/5968): Prevent `Layout/ClosingHeredocIndentation` from raising an error on `<<` heredocs. ([@dvandersluis][])
* [#5965](https://github.com/rubocop/rubocop/issues/5965): Prevent `Layout/ClosingHeredocIndentation` from raising an error on heredocs containing only a newline. ([@drenmi][])
* Prevent a crash in `Layout/IndentationConsistency` cop triggered by an empty expression string interpolation. ([@alexander-lazarov][])
* [#5951](https://github.com/rubocop/rubocop/issues/5951): Prevent `Style/MethodCallWithArgsParentheses` from raising an error in certain cases. ([@drenmi][])

[@dvandersluis]: https://github.com/dvandersluis
[@drenmi]: https://github.com/drenmi
[@alexander-lazarov]: https://github.com/alexander-lazarov