update puma

Gemfile

@@ -9,7 +9,7 @@ gem 'rails', '~> 5.2.0'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3', '~> 1.3', '< 1.4'
 # Use Puma as the app server
-gem 'puma', '~> 4.0'
+gem 'puma'
 
 # Use SCSS for stylesheets
 gem 'sass-rails',

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
     public_suffix (4.0.6)
-    puma (4.3.8)
+    puma (5.3.2)
       nio4r (~> 2.0)
     racc (1.5.2)
     rack (2.2.3)
@@ -223,7 +223,7 @@ DEPENDENCIES
   gpgme
   jquery-rails
   listen (>= 3.0.5, < 3.2)
-  puma (~> 4.0)
+  puma
   rails (~> 5.2.0)
   rest-client
   rotp