Bump puma from 5.6.2 to 5.6.4 (sass#619)

Bumps [puma](https://github.com/puma/puma) from 5.6.2 to 5.6.4.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.6.2...v5.6.4)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -131,7 +131,7 @@ GEM
     padrino-support (0.12.9)
       activesupport (>= 3.1)
     parallel (1.18.0)
-    puma (5.6.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (1.6.12)