Bump puma from 5.6.8 to 5.6.9 (#2654)

Bumps [puma](https://github.com/puma/puma) from 5.6.8 to 5.6.9.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v5.6.8...v5.6.9)

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

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Gemfile.lock

@@ -314,7 +314,7 @@ GEM
       byebug (~> 11.0)
       pry (>= 0.13, < 0.15)
     public_suffix (5.0.4)
-    puma (5.6.8)
+    puma (5.6.9)
       nio4r (~> 2.0)
     pundit (2.3.1)
       activesupport (>= 3.0.0)