Bump puma from 3.12.6 to 4.3.5

Bumps [puma](https://github.com/puma/puma) from 3.12.6 to 4.3.5.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/commits)

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

Gemfile

@@ -143,7 +143,7 @@ group :test do
   gem "erb_lint", :require => false
   gem "factory_bot_rails"
   gem "minitest", "~> 5.1"
-  gem "puma", "~> 3.11"
+  gem "puma", "~> 4.3"
   gem "rails-controller-testing"
   gem "rubocop"
   gem "rubocop-minitest"

Gemfile.lock

@@ -328,7 +328,8 @@ GEM
     progress (3.5.2)
     psych (3.1.0)
     public_suffix (4.0.5)
-    puma (3.12.6)
+    puma (4.3.5)
+      nio4r (~> 2.0)
     quad_tile (1.0.1)
     r2 (0.2.7)
     rack (2.2.3)
@@ -526,7 +527,7 @@ DEPENDENCIES
   openstreetmap-deadlock_retry (>= 1.3.0)
   pg
   psych
-  puma (~> 3.11)
+  puma (~> 4.3)
   quad_tile (~> 1.0.1)
   r2 (~> 0.2.7)
   rack-cors