Bump puma from 3.12.6 to 5.6.7

Bumps [puma](https://github.com/puma/puma) from 3.12.6 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@v3.12.6...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', '>= 5.2.4.4'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 5.6'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production

Gemfile.lock

@@ -134,7 +134,8 @@ GEM
     pry (0.13.1)
       coderay (~> 1.1)
       method_source (~> 1.0)
-    puma (3.12.6)
+    puma (5.6.7)
+      nio4r (~> 2.0)
     rack (2.2.3)
     rack-cors (1.1.1)
       rack (>= 2.0.0)
@@ -254,7 +255,7 @@ DEPENDENCIES
   listen (>= 3.0.5, < 3.2)
   mimemagic (~> 0.3.7)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 5.6)
   rack-cors
   rails (~> 5.2.4, >= 5.2.4.4)
   redis (~> 4.0)