Bump puma from 5.6.8 to 5.6.9 (#415)

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
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Riccardo Graziosi <31478034+riggraz@users.noreply.github.com>

Gemfile

@@ -9,7 +9,7 @@ gem 'rails', '6.1.7.8'
 
 gem 'pg', '1.3.5'
 
-gem 'puma', '5.6.8'
+gem 'puma', '5.6.9'
 
 gem 'turbolinks', '5.2.1'
 

Gemfile.lock

@@ -166,7 +166,7 @@ GEM
     orm_adapter (0.5.0)
     pg (1.3.5)
     public_suffix (4.0.7)
-    puma (5.6.8)
+    puma (5.6.9)
       nio4r (~> 2.0)
     pundit (2.2.0)
       activesupport (>= 3.0.0)
@@ -299,7 +299,7 @@ DEPENDENCIES
   kaminari (= 1.2.2)
   listen (= 3.5.1)
   pg (= 1.3.5)
-  puma (= 5.6.8)
+  puma (= 5.6.9)
   pundit (= 2.2.0)
   rack-attack (= 6.7.0)
   rails (= 6.1.7.8)