Bump puma from 5.6.5 to 6.4.0 in /graph-sample

Bumps [puma](https://github.com/puma/puma) from 5.6.5 to 6.4.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v5.6.5...v6.4.0)

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

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

Author: dependabot[bot]

graph-sample/Gemfile

@@ -13,7 +13,7 @@ gem "sprockets-rails"
 gem "sqlite3", "~> 1.6"
 
 # Use the Puma web server [https://github.com/puma/puma]
-gem "puma", "~> 5.0"
+gem "puma", "~> 6.4"
 
 # Use JavaScript with ESM import maps [https://github.com/rails/importmap-rails]
 gem "importmap-rails"

graph-sample/Gemfile.lock

@@ -159,7 +159,7 @@ GEM
       timeout
     net-smtp (0.4.0)
       net-protocol
-    nio4r (2.5.9)
+    nio4r (2.7.0)
     nokogiri (1.15.4-x86_64-linux)
       racc (~> 1.4)
     oauth2 (2.0.9)
@@ -182,7 +182,7 @@ GEM
     psych (5.1.1.1)
       stringio
     public_suffix (5.0.1)
-    puma (5.6.5)
+    puma (6.4.0)
       nio4r (~> 2.0)
     racc (1.7.3)
     rack (2.2.8)
@@ -291,7 +291,7 @@ DEPENDENCIES
   jbuilder
   omniauth-oauth2 (~> 1.8.0)
   omniauth-rails_csrf_protection (~> 1.0.1)
-  puma (~> 5.0)
+  puma (~> 6.4)
   rails (~> 7.1.2)
   selenium-webdriver
   sprockets-rails