Bump puma from 3.12.6 to 4.3.12

Bumps [puma](https://github.com/puma/puma) from 3.12.6 to 4.3.12.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.12.6...v4.3.12)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.3'
 gem 'bootstrap-sass'
 gem 'popper_js'
 gem 'pg', '>= 0.18', '< 2.0'
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 gem 'devise'
 gem 'doorkeeper'
 gem 'will_paginate'

Gemfile.lock

@@ -160,7 +160,8 @@ GEM
     pg (1.3.5)
     popper_js (2.9.3)
     public_suffix (4.0.7)
-    puma (3.12.6)
+    puma (4.3.12)
+      nio4r (~> 2.0)
     racc (1.6.0)
     rack (2.2.3.1)
     rack-cors (1.1.1)
@@ -319,7 +320,7 @@ DEPENDENCIES
   pagy (~> 3.5)
   pg (>= 0.18, < 2.0)
   popper_js
-  puma (~> 3.11)
+  puma (~> 4.3)
   rack-cors (>= 1.0.4)
   rails (~> 5.2.3)
   rails-html-sanitizer (~> 1.0.4)