dependency: bump puma from 5.3.0 to 5.3.1

Bumps puma from 5.3.0 to 5.3.1.

Changelog

Sourced from puma's changelog.

5.3.1 / 2021-05-11

• Security
  • Close keepalive connections after the maximum number of fast inlined requests (#2625)

Commits

• 1c91a4f 5.3.1
• 6b4a68a 4.3.8 release note
• df72887 Close keepalive connections after MAX_FAST_INLINE requests
• See full diff in compare view

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