Update VersionChanged for Rails/SkipsModelValidations

[koic]

Follow up of #6392.

#6392 has been changed in RuboCop 0.60. (The next version of 0.59.2 is not 0.59.3.)

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Before submitting the PR make sure the following are checked:

• Wrote good commit messages.
• Commit message starts with [Fix #issue-number] (if the related issue exists).
• Feature branch is up-to-date with master (if not - rebase it).
• Squashed related commits together.
• Added tests.
• Added an entry to the Changelog if the new code introduces user-observable changes. See changelog entry format.
• The PR relates to only one subject with a clear title
  and description in grammatically correct, complete sentences.
• Run rake default. It executes all tests and RuboCop for itself, and generates the documentation.

[koic]

I have a question at this PR and wrote it to #5976 (comment).