Bump puma from 4.3.12 to 5.6.7 in /source/scripts/ruby/blog/source

Bumps [puma](https://github.com/puma/puma) from 4.3.12 to 5.6.7.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v4.3.12...v5.6.7)

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

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

source/scripts/ruby/blog/source/Gemfile

@@ -11,7 +11,7 @@ gem 'rails', '~> 5.0.1'
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use Puma as the app server
-gem 'puma', '~> 4.3'
+gem 'puma', '~> 5.6'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets

source/scripts/ruby/blog/source/Gemfile.lock

@@ -76,11 +76,11 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.8.2)
     minitest (5.18.0)
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.14.3)
       mini_portile2 (~> 2.8.0)
       racc (~> 1.4)
-    puma (4.3.12)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.7)
@@ -165,7 +165,7 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   listen (~> 3.0.5)
-  puma (~> 4.3)
+  puma (~> 5.6)
   rails (~> 5.0.1)
   sass-rails (~> 5.0)
   spring