Bump puma from 6.0.2 to 6.3.1

Bumps [puma](https://github.com/puma/puma) from 6.0.2 to 6.3.1.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.0.2...v6.3.1)

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

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

Gemfile.lock

@@ -19,14 +19,14 @@ GEM
     multi_json (1.15.0)
     mustermann (3.0.0)
       ruby2_keywords (~> 0.0.1)
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.14.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
     parallel (1.22.1)
     parser (3.2.0.0)
       ast (~> 2.4.1)
-    puma (6.0.2)
+    puma (6.3.1)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.4)