Bump puma from 3.12.1 to 4.1.1

Bumps [puma](https://github.com/puma/puma) from 3.12.1 to 4.1.1.
- [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/v3.12.1...v4.1.1)

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

Gemfile

@@ -74,7 +74,7 @@ group :development, :test do
   gem "knapsack_pro", "~> 1.1.0"
   gem "launchy", "~> 2.4.3"
   gem "letter_opener_web", "~> 1.3.4"
-  gem "puma", "~> 3.12.1"
+  gem "puma", "~> 4.1.1"
   gem "spring", "~> 2.0.1"
   gem "spring-commands-rspec", "~> 1.0.4"
 end

Gemfile.lock

@@ -389,7 +389,8 @@ GEM
       arel (>= 6)
     powerpack (0.1.2)
     public_suffix (4.0.1)
-    puma (3.12.1)
+    puma (4.1.1)
+      nio4r (~> 2.0)
     rack (2.0.6)
     rack-accept (0.4.5)
       rack (>= 0.4)
@@ -637,7 +638,7 @@ DEPENDENCIES
   paranoia (~> 2.4.2)
   pg (~> 0.21.0)
   pg_search (~> 2.0.1)
-  puma (~> 3.12.1)
+  puma (~> 4.1.1)
   rails (= 5.0.7.2)
   rails-assets-leaflet!
   rails-assets-markdown-it (~> 8.2.1)!