Bump puma in /Ruby/progate/rails5_study_10/tweet_app

Bumps [puma](https://github.com/puma/puma) from 3.6.2 to 3.12.6.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.6.2...v3.12.6)

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

Ruby/progate/rails5_study_10/tweet_app/Gemfile

@@ -2,7 +2,7 @@ source 'https://rubygems.org'
 
 gem 'rails', '5.0.3'
 # Use Puma as the app server
-gem 'puma', '3.6.2'
+gem 'puma', '3.12.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '5.0.6'
 # Use Uglifier as compressor for JavaScript assets

Ruby/progate/rails5_study_10/tweet_app/Gemfile.lock

@@ -79,7 +79,7 @@ GEM
       slop (~> 3.4)
     pry-rails (0.3.4)
       pry (>= 0.9.10)
-    puma (3.6.2)
+    puma (3.12.6)
     racc (1.5.2)
     rack (2.2.3)
     rack-test (0.6.3)
@@ -160,7 +160,7 @@ DEPENDENCIES
   jquery-rails (= 4.2.2)
   listen (= 3.0.8)
   pry-rails (= 0.3.4)
-  puma (= 3.6.2)
+  puma (= 3.12.6)
   rails (= 5.0.3)
   sass-rails (= 5.0.6)
   spring (= 2.0.1)