Bump puma from 4.3.12 to 5.6.7

Bumps [puma](https://github.com/puma/puma) from 4.3.12 to 5.6.7.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v4.3.12...v5.6.7)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile

@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets

Gemfile.lock

@@ -104,14 +104,14 @@ GEM
     mock_redis (0.31.0)
       ruby2_keywords
     msgpack (1.5.2)
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.14.3-arm64-darwin)
       racc (~> 1.4)
     nokogiri (1.14.3-x86_64-linux)
       racc (~> 1.4)
     pg (1.3.5)
     public_suffix (4.0.7)
-    puma (4.3.12)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.4)
@@ -216,7 +216,7 @@ DEPENDENCIES
   minitest-stub-const
   mock_redis
   pg (>= 0.18, < 2.0)
-  puma (~> 4.3)
+  puma (~> 5.6)
   rails (~> 5.2.4)
   redis (~> 4.0)
   sass-rails (~> 5.0)