[ruby] Upgrade rubocop to version 0.67.2

[depfu]

Here is everything you need to know about this upgrade. Please take a good look at what changed and the test results before merging this pull request.

What changed?

✳️ rubocop (~> 0.66.0 → ~> 0.67.2) · Repo · Changelog

Release Notes

0.67.2

Bug fixes

• #6882: Fix an error for Rails/RedundantAllowNil when not using both allow_nil and allow_blank. (@koic)

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 3 commits:

• Cut 0.67.2
• Fix a typo
• [Fix #6882] Fix an error for `Rails/RedundantAllowNil`

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[codecov-io]

Codecov Report

Merging #64 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #64   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines          34     34           
=====================================
  Hits           34     34

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