Bump puma from 3.12.1 to 3.12.4

Gemfile

@@ -8,7 +8,7 @@ gem 'rails', '~> 6.0.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.4'
 # 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

Gemfile.lock

@@ -73,10 +73,10 @@ GEM
       xpath (~> 3.2)
     childprocess (1.0.1)
       rake (< 13.0)
-    colorize (0.8.1)
     concurrent-ruby (1.1.5)
     crass (1.0.4)
     erubi (1.8.0)
+    ffi (1.11.1)
     ffi (1.11.1-x64-mingw32)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
@@ -96,12 +96,15 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
+    msgpack (1.3.1)
     msgpack (1.3.1-x64-mingw32)
     nio4r (2.4.0)
+    nokogiri (1.10.4)
+      mini_portile2 (~> 2.4.0)
     nokogiri (1.10.4-x64-mingw32)
       mini_portile2 (~> 2.4.0)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-proxy (0.6.5)
       rack
@@ -140,10 +143,6 @@ GEM
     rb-inotify (0.10.0)
       ffi (~> 1.0)
     regexp_parser (1.6.0)
-    rename (1.0.6)
-      activesupport
-      rails (>= 3.0.0)
-      thor (>= 0.19.1)
     rubyzip (1.2.3)
     sass (3.7.4)
       sass-listen (~> 4.0.0)
@@ -198,18 +197,17 @@ GEM
     zeitwerk (2.1.9)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
   bootsnap (>= 1.4.2)
   byebug
   capybara (>= 2.15)
-  colorize (~> 0.8.1)
   jbuilder (~> 2.7)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 6.0.0)
   rails_autolink
-  rename
   sass-rails (~> 5)
   selenium-webdriver
   sqlite3 (~> 1.4)