Bump puma from 3.12.0 to 3.12.2

Bumps [puma](https://github.com/puma/puma) from 3.12.0 to 3.12.2.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.12.0...v3.12.2)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Gemfile

@@ -12,7 +12,7 @@ gem 'rails', '~> 5.2.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '~> 1.1'
 # Use Puma as the app server
-gem 'puma', '3.12.0'
+gem 'puma', '3.12.2'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0.7'
 # Autoprefix CSS rules using values from Can I Use

Gemfile.lock

@@ -354,7 +354,7 @@ GEM
     pry-rails (0.3.6)
       pry (>= 0.10.4)
     public_suffix (3.0.3)
-    puma (3.12.0)
+    puma (3.12.2)
     rack (2.0.6)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -570,7 +570,7 @@ DEPENDENCIES
   premailer-rails (~> 1.10)
   pry-byebug (~> 3.6)
   pry-rails (~> 0.3)
-  puma (= 3.12.0)
+  puma (= 3.12.2)
   rails (~> 5.2.1)
   rails_real_favicon (~> 0.0.11)
   rollbar (~> 2.15)