Bump puma from 4.3.6 to 4.3.8

Bumps [puma](https://github.com/puma/puma) from 4.3.6 to 4.3.8.
- [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/v4.3.6...v4.3.8)

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

Gemfile

@@ -9,7 +9,7 @@ gem 'rails-i18n', '~> 6.0.0'
 # Use mysql as the database for Active Record
 gem 'mysql2', '>= 0.4.4', '< 0.6.0'
 # Use Puma as the app server
-gem 'puma', '~> 4.0'
+gem 'puma', '~> 4.3'
 
 gem 'devise', '~> 4.7'
 gem 'devise-i18n', '~> 1.8'

Gemfile.lock

@@ -187,7 +187,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (1.0.0)
-    mimemagic (0.3.5)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.14.2)
@@ -199,7 +201,7 @@ GEM
     net-scp (3.0.0)
       net-ssh (>= 2.6.5, < 7.0.0)
     net-ssh (6.1.0)
-    nio4r (2.5.3)
+    nio4r (2.5.7)
     nokogiri (1.10.10)
       mini_portile2 (~> 2.4.0)
     notiffany (0.1.3)
@@ -223,7 +225,7 @@ GEM
     pry-rails (0.3.9)
       pry (>= 0.10.4)
     public_suffix (4.0.6)
-    puma (4.3.6)
+    puma (4.3.8)
       nio4r (~> 2.0)
     pundit (1.1.0)
       activesupport (>= 3.0.0)
@@ -397,7 +399,7 @@ DEPENDENCIES
   open4
   pry-byebug
   pry-rails
-  puma (~> 4.0)
+  puma (~> 4.3)
   pundit (~> 1.1)
   rack-contrib
   rails (~> 6.0.3)