Bump puma from 6.5.0 to 6.6.0 in /graph-sample

Bumps [puma](https://github.com/puma/puma) from 6.5.0 to 6.6.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v6.5.0...v6.6.0)

---
updated-dependencies:
- dependency-name: puma
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

graph-sample/Gemfile

@@ -13,7 +13,7 @@ gem "sprockets-rails"
 gem "sqlite3", "~> 2.5"
 
 # Use the Puma web server [https://github.com/puma/puma]
-gem "puma", "~> 6.5"
+gem "puma", "~> 6.6"
 
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
 gem "importmap-rails"

graph-sample/Gemfile.lock

@@ -190,7 +190,7 @@ GEM
       date
       stringio
     public_suffix (6.0.1)
-    puma (6.5.0)
+    puma (6.6.0)
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.1.8)
@@ -300,7 +300,7 @@ DEPENDENCIES
   omniauth-oauth2 (~> 1.8.0)
   omniauth-rails_csrf_protection (~> 1.0.2)
   ostruct (~> 0.6.1)
-  puma (~> 6.5)
+  puma (~> 6.6)
   rails (~> 7.2.2)
   selenium-webdriver
   sprockets-rails