Bump puma from 4.3.8 to 4.3.9

Bumps [puma](https://github.com/puma/puma) from 4.3.8 to 4.3.9.
- [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/v4.3.8...v4.3.9)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
...

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

Gemfile

@@ -7,7 +7,7 @@ gem 'rails', '~> 5.2.4'
 # Used by rails 5.2 to reduce the app boot time by over 50%
 gem 'bootsnap'
 # Use Puma as web server
-gem 'puma', '4.3.8'
+gem 'puma', '4.3.9'
 gem 'webpacker', '~> 5.x'
 
 # Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder

Gemfile.lock

@@ -216,7 +216,7 @@ GEM
     multi_json (1.14.1)
     multi_xml (0.6.0)
     multipart-post (2.1.1)
-    nio4r (2.5.7)
+    nio4r (2.5.8)
     nokogiri (1.11.4)
       mini_portile2 (~> 2.5.0)
       racc (~> 1.4)
@@ -264,7 +264,7 @@ GEM
     prawn-table (0.2.2)
       prawn (>= 1.3.0, < 3.0.0)
     public_suffix (4.0.6)
-    puma (4.3.8)
+    puma (4.3.9)
       nio4r (~> 2.0)
     pundit (2.1.0)
       activesupport (>= 3.0.0)
@@ -470,7 +470,7 @@ DEPENDENCIES
   pg_search
   prawn
   prawn-table
-  puma (= 4.3.8)
+  puma (= 4.3.9)
   pundit
   railroady
   rails (~> 5.2.4)