Update rubocop-packaging requirement from ~> 0.3.0 to ~> 0.4.0

[dependabot-preview[bot]]

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

Release notes

Sourced from rubocop-packaging's releases.

v0.4.0

New features:

#16: Add new RequireWithRelativePath cop. (@utkarsh2102) #18: Add new BundlerSetupInTests cop. (@utkarsh2102)

Changes:

#19: Adapt GemspecGit cop to new API changes. (@utkarsh2102) #20: Enhance documentation & host it on https://docs.rubocop.org/rubocop-packaging. (@utkarsh2102) (many thanks to @bbatsov for giving space and hosting it!)

Commits

• e510d49 Cut v0.4.0 release
• 2940773 Add reasoning behind this extension
• d5674a8 Remove 'more information' block
• b5b92df Add rationale for the RequireRelativeHardcodingLib cop
• 9f4d79e Add rationale for the GemspecGit cop
• 3acb2da Enhance documentation and adapt to adoc format
• 802b1ab Don't run generate_cops_documentation by default
• 52193f7 Adapt GemspecGit cop to new API changes
• 6f179b0 Update docs/ in reference with @8fe0683
• c8d07ed Write documentation and update the docs/
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Superseded by #65.