Bump puma from 6.4.1 to 6.4.2

Bumps [puma](https://github.com/puma/puma) from 6.4.1 to 6.4.2.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.4.1...v6.4.2)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile.lock

@@ -258,7 +258,7 @@ GEM
     psych (5.1.2)
       stringio
     public_suffix (5.0.3)
-    puma (6.4.1)
+    puma (6.4.2)
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.7.3)