Bump puma from 5.1.1 to 5.6.4 in /shopinvader

Bumps [puma](https://github.com/puma/puma) from 5.1.1 to 5.6.4.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.1.1...v5.6.4)

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

Signed-off-by: dependabot[bot] <[email protected]>

shopinvader/Gemfile

@@ -19,7 +19,7 @@ gem 'mongo_session_store', '~> 3.1.0'
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '~> 5.2.3'
 # Use Puma as the app server
-gem 'puma', '~> 5.1.0'
+gem 'puma', '~> 5.6.4'
 gem 'puma_worker_killer'
 # gem 'passenger-rails'
 gem 'rack-cors', require: 'rack/cors'

shopinvader/Gemfile.lock

@@ -428,7 +428,7 @@ GEM
     procto (0.0.3)
     progress (3.6.0)
     public_suffix (5.0.0)
-    puma (5.1.1)
+    puma (5.6.4)
       nio4r (~> 2.0)
     puma_worker_killer (0.3.1)
       get_process_mem (~> 0.2)
@@ -583,7 +583,7 @@ DEPENDENCIES
   locomotivecms_steam (= 1.6.0)
   mongo_session_store (~> 3.1.0)
   mongoid
-  puma (~> 5.1.0)
+  puma (~> 5.6.4)
   puma_worker_killer
   rack-cors
   rails (~> 5.2.3)