Update rubocop-packaging requirement from ~> 0.3.0 to ~> 0.5.1

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Updates the requirements on rubocop-packaging to permit the latest version.

Release notes

Sourced from rubocop-packaging's releases.

v0.5.1

This is a very small release to make RuboCop::Packaging compatible with the very new, shiny v1.0.0 of RuboCop! 🎉

Changes:

#32: Fix HTML id attribute in cops_packaging.adoc. (@koic) #33: Loosen requirement of RuboCop. (@jasl)

Commits

• ad12303 Cut v0.5.1 release
• 94688ab Remove redundant lines from .rubocop.yml
• 0c03361 Run tests against ruby-head on CI
• b82934c Bump ruby2.7 pipeline to 2.7.2
• 8756f99 Merge pull request #33 from jasl/loosen-rubocop-requirement
• 26d7cc6 Loosen requirement of Rubocop
• f262d22 Merge pull request #32 from koic/fix_html_id_attribute_in_cop_packaging_adoc
• 6c20312 Fix HTML id attribute in cops_packaging.adoc
• 0ff30a3 Fix RequireRelativeHardcodingLib examples
• a9925e7 Remove obsolete line in config/default.yml
• Additional commits viewable in compare view

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