Bump puma from 3.12.1 to 3.12.2 in /11.app-final/rails-app

Bumps [puma](https://github.com/puma/puma) from 3.12.1 to 3.12.2.
- [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/v3.12.1...v3.12.2)
Signed-off-by: dependabot[bot] <support@github.com>

11.app-final/rails-app/Gemfile

@@ -9,7 +9,7 @@ gem 'rails', '~> 6.0.0.rc1'
 # gem 'sqlite3', '~> 1.4'
 gem 'mysql2'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5'
 # Transpile app-like JavaScript. Read more: https://github.com/rails/webpacker

11.app-final/rails-app/Gemfile.lock

@@ -104,11 +104,12 @@ GEM
     mini_portile2 (2.4.0)
     minitest (5.11.3)
     msgpack (1.2.10)
+    mysql2 (0.5.3)
     nio4r (2.3.1)
     nokogiri (1.10.3)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.0)
-    puma (3.12.1)
+    puma (3.12.2)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -175,7 +176,6 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sqlite3 (1.4.1)
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.9)
@@ -214,13 +214,13 @@ DEPENDENCIES
   image_processing (~> 1.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  mysql2
+  puma (~> 3.12)
   rails (~> 6.0.0.rc1)
   sass-rails (~> 5)
   selenium-webdriver
   spring
   spring-watcher-listen (~> 2.0.0)
-  sqlite3 (~> 1.4)
   turbolinks (~> 5)
   tzinfo-data
   web-console (>= 3.3.0)