Bump puma from 5.6.4 to 5.6.7 in /examples/rails_example (#31)

Bumps [puma](https://github.com/puma/puma) from 5.6.4 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@v5.6.4...v5.6.7)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/rails_example/Gemfile

@@ -19,7 +19,7 @@ gem "sprockets-rails"
 gem "sqlite3", "~> 1.4"
 
 # Use the Puma web server [https://github.com/puma/puma]
-gem "puma", "~> 5.0"
+gem "puma", "~> 5.6"
 
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
 gem "importmap-rails"

examples/rails_example/Gemfile.lock

@@ -162,13 +162,13 @@ GEM
       digest
       net-protocol
       timeout
-    nio4r (2.5.8)
+    nio4r (2.5.9)
     nokogiri (1.14.3-x86_64-darwin)
       racc (~> 1.4)
     nokogiri (1.14.3-x86_64-linux)
       racc (~> 1.4)
     public_suffix (4.0.7)
-    puma (5.6.4)
+    puma (5.6.7)
       nio4r (~> 2.0)
     racc (1.6.2)
     rack (2.2.6.4)
@@ -265,7 +265,7 @@ DEPENDENCIES
   featurehub-sdk
   importmap-rails
   jbuilder
-  puma (~> 5.0)
+  puma (~> 5.6)
   rails (~> 7.0.3)
   selenium-webdriver
   sprockets-rails