Bump puma from 3.12.0 to 3.12.1

Bumps [puma](https://github.com/puma/puma) from 3.12.0 to 3.12.1.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.12.0...v3.12.1)

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

Gemfile

@@ -33,7 +33,7 @@ gem "aasm", '~> 3.4.0'
 gem "htmlentities"
 gem "swf_fu"
 gem "rails_autolink"
-gem 'puma', '~> 3.0'
+gem 'puma', '~> 3.12'
 gem 'paperclip'
 
 # To use ActiveModel has_secure_password

Gemfile.lock

@@ -147,7 +147,7 @@ GEM
       ast (~> 2.4.0)
     powerpack (0.1.2)
     psych (3.1.0)
-    puma (3.12.0)
+    puma (3.12.1)
     rack (2.0.6)
     rack-mini-profiler (1.0.2)
       rack (>= 1.2.0)
@@ -297,7 +297,7 @@ DEPENDENCIES
   mocha
   mysql2 (~> 0.5.2)
   paperclip
-  puma (~> 3.0)
+  puma (~> 3.12)
   rack-mini-profiler
   rails (~> 5.2.2)
   rails-controller-testing