Bump parallel from 1.20.1 to 1.21.0

Created by: dependabot[bot]

Bumps parallel from 1.20.1 to 1.21.0.

Commits

• 900b87a v1.21.0
• f365c48 Add support for darwin20
• 0f8a13d fix rubocop
• 860cd8c rubocop
• 1243fea Merge pull request #303 from henrich/patch-1
• 60f8606 Avoid thousands of lsof warnings in chroot
• e100693 Merge pull request #301 from pedromartinez/revert-299-patch-1
• af122dc Revert "Add support for darwin20"
• fdd4dca v1.20.2
• f456129 Merge pull request #299 from pedromartinez/patch-1
• Additional commits viewable in compare view

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