Bump puma from 5.6.7 to 5.6.8 (#82)

Bumps [puma](https://github.com/puma/puma) from 5.6.7 to 5.6.8.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.6.7...v5.6.8)

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

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

Gemfile

@@ -10,7 +10,7 @@ gem 'rails', '~> 6.0.3'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4'
 # Use Puma as the app server
-gem 'puma', '~> 5.6.7'
+gem 'puma', '~> 5.6.8'
 # Use SCSS for stylesheets
 gem 'sass-rails', '>= 6'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker

Gemfile.lock

@@ -125,14 +125,14 @@ GEM
     minitest (5.17.0)
     msgpack (1.4.4)
     mysql2 (0.5.3)
-    nio4r (2.5.9)
+    nio4r (2.7.0)
     nokogiri (1.15.4)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     parallel (1.21.0)
     parser (3.1.0.0)
       ast (~> 2.4.1)
-    puma (5.6.7)
+    puma (5.6.8)
       nio4r (~> 2.0)
     racc (1.7.1)
     rack (2.2.8)
@@ -285,7 +285,7 @@ DEPENDENCIES
   jquery-rails (~> 4.4)
   listen (~> 3.2)
   mysql2 (>= 0.4.4)
-  puma (~> 5.6.7)
+  puma (~> 5.6.8)
   rails (~> 6.0.3)
   react-rails
   rspec-rails (~> 4.0)