Bump puma from 6.3.1 to 6.4.0 (#62)

Bumps [puma](https://github.com/puma/puma) from 6.3.1 to 6.4.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.3.1...v6.4.0)

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

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

Gemfile.lock

@@ -58,7 +58,7 @@ GEM
     minitest (5.19.0)
     multi_json (1.7.9)
     nio4r (2.5.9)
-    puma (6.3.1)
+    puma (6.4.0)
       nio4r (~> 2.0)
     rack (1.6.13)
     rack-protection (1.5.5)