chore(deps): update dependency rubocop-performance to '~> 1.21.0'

This MR contains the following updates:

Package	Update	Change
rubocop-performance (source, changelog)	minor	'~> 1.20.0' -> '~> 1.21.0'

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Release Notes

rubocop/rubocop-performance (rubocop-performance)

v1.21.0

Compare Source

New features

• #​446: Support Prism as a Ruby parser (experimental). ([@​koic][])

Bug fixes

• #​437: Fix a false positive for Performance/ChainArrayAllocation when using select with block argument after select. ([@​koic][])
• #​448: Fix a false positive for Performance/RedundantBlockCall when using block.call with block argument. ([@​koic][])

Changes

• #​240: Disable Performance/Casecmp cop by default. ([@​parkerfinch][])

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