Commits on Mar 9, 2022

1. Add new Style/NestedFileDirname cop …

   ## Summary
   
   This cop checks for nested `File.dirname`.
   It replaces nested `File.dirname` with the level argument introduced in Ruby 3.1.
   
   ```ruby
   # bad
   File.dirname(File.dirname(path))
   
   # good
   File.dirname(path, 2)
   ```
   
   See: https://bugs.ruby-lang.org/issues/12194
   
   ## Other Information
   
   For `File.expand_path('../..', path)`, there is a partial conflict with `Style/ExpandPathArguments` cop.
   So this PR does not support it.
   https://docs.rubocop.org/rubocop/1.25/cops_style.html#styleexpandpatharguments

   

   koic committed Mar 9, 2022
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