Merge pull request #214 from ohbarye/dependabot/bundler/backend/puma-4.2.1

Bump puma from 3.12.1 to 4.2.1 in /backend

Author: Masato Ohba

backend/Gemfile

@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.12'
+gem 'puma', '~> 4.2'
 # See https://github.com/rails/execjs#readme for more supported runtimes
 # gem 'mini_racer', platforms: :ruby
 

backend/Gemfile.lock

@@ -105,7 +105,8 @@ GEM
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.2.1)
+      nio4r (~> 2.0)
     rack (2.0.7)
     rack-cors (1.0.3)
     rack-test (1.1.0)
@@ -186,7 +187,7 @@ DEPENDENCIES
   jbuilder (~> 2.9)
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.12)
+  puma (~> 4.2)
   rack-cors
   rails (~> 6.0.0)
   selenium-webdriver