Bump puma from 3.12.2 to 4.3.3 in /spec/integration/rails_5.2.4.1 (#769)

Bumps [puma](https://github.com/puma/puma) from 3.12.2 to 4.3.3.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v3.12.2...v4.3.3)

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

Author: dependabot[bot]

spec/integration/rails_5.2.4.1/Gemfile

@@ -6,7 +6,7 @@ gem 'rails', '~> 5.2.4', '>= 5.2.4.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 4.3'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets

spec/integration/rails_5.2.4.1/Gemfile.lock

@@ -111,7 +111,8 @@ GEM
     nokogiri (1.10.8)
       mini_portile2 (~> 2.4.0)
     public_suffix (4.0.3)
-    puma (3.12.2)
+    puma (4.3.3)
+      nio4r (~> 2.0)
     rack (2.1.2)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -201,7 +202,7 @@ DEPENDENCIES
   coffee-rails (~> 4.2)
   jbuilder (~> 2.5)
   listen (>= 3.0.5, < 3.2)
-  puma (~> 3.11)
+  puma (~> 4.3)
   rails (~> 5.2.4, >= 5.2.4.1)
   sass-rails (~> 5.0)
   selenium-webdriver