Bump puma from 5.6.5 to 5.6.7 (#56)

Bumps [puma](https://github.com/puma/puma) from 5.6.5 to 5.6.7.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.6.5...v5.6.7)

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

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Gemfile.lock

@@ -162,7 +162,7 @@ GEM
       racc
     pg (1.4.5)
     public_suffix (5.0.3)
-    puma (5.6.5)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.7)