Bump puma from 3.12.0 to 3.12.2 in /qit-api

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] <support@github.com>

Author: dependabot[bot]

qit-api/Gemfile

@@ -8,7 +8,7 @@ gem 'rails', '~> 5.2.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
 # gem 'jbuilder', '~> 2.5'
 # Use Redis adapter to run Action Cable in production

qit-api/Gemfile.lock

@@ -86,7 +86,7 @@ GEM
     nokogiri (1.8.4)
       mini_portile2 (~> 2.3.0)
     pg (1.1.3)
-    puma (3.12.0)
+    puma (3.12.2)
     rack (2.0.5)
     rack-cors (1.0.2)
     rack-test (1.1.0)
@@ -151,7 +151,7 @@ DEPENDENCIES
   jwt
   listen (>= 3.0.5, < 3.2)
   pg (>= 0.18, < 2.0)
-  puma (~> 3.11)
+  puma (~> 3.12)
   rack-cors
   rails (~> 5.2.1)
   spring