…870)

The existing version of RuboCop no longer works against other libraries
without deprecation warnings; rather than lock more dependencies,
upgrade RuboCop used in project.

```sh
Running pre-commit hooks
Check YAML syntax........................................[YamlSyntax] OK
Check Gemfile dependencies..............................[BundleCheck] OK
Check for trailing whitespace....................[TrailingWhitespace] OK
Analyze with RuboCop........................................[RuboCop] FAILED
Unexpected output: unable to determine line number or type of error/warning for output:
`EnsureNode#body` is deprecated and will be changed in the next major version of rubocop-ast. Use `EnsureNode#branch` instead to get the body of the `ensure` branch.
Called from:
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/layout/indentation_width.rb:67:in `on_ensure'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:107:in `public_send'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:107:in `block (2 levels) in trigger_responding_cops'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:171:in `with_cop_error_handling'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:106:in `block in trigger_responding_cops'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:105:in `each'
/Users/broz/.rbenv/versions/3.1.6/lib/ruby/gems/3.1.0/gems/rubocop-1.63.0/lib/rubocop/cop/commissioner.rb:105:in
`trigger_responding_cops'
[...]
```

[Solargraph](https://github.com/castwide/solargraph) supports
typechecking Ruby files based on YARD tags - combined with overcommit,
it can be used in an incremental way on large untyped codebases.