Update dependency puma to v7 (#230)

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This PR contains the following updates:

| Package | Change | Age | Confidence |
|---|---|---|---|
| puma | `'6.6.0'` -> `'7.0.4'` |
[![age](https://developer.mend.io/api/mc/badges/age/rubygems/puma/7.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/rubygems/puma/6.6.0/7.0.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

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Gemfile

@@ -7,7 +7,7 @@ gem 'bootsnap', '1.18.6', require: false
 gem 'coffee-rails', '5.0.0'
 gem 'jbuilder', '2.14.1'
 gem 'mysql2', '0.5.7'
-gem 'puma', '6.6.0'
+gem 'puma', '7.0.4'
 gem 'rails', '8.0.3'
 gem 'sass-rails', '6.0.0'
 gem 'turbolinks', '5.2.1'

Gemfile.lock

@@ -186,7 +186,7 @@ GEM
       date
       stringio
     public_suffix (6.0.2)
-    puma (6.6.0)
+    puma (7.0.4)
       nio4r (~> 2.0)
     racc (1.8.1)
     rack (3.2.1)
@@ -349,7 +349,7 @@ DEPENDENCIES
   mysql2 (= 0.5.7)
   pry-byebug
   pry-rails
-  puma (= 6.6.0)
+  puma (= 7.0.4)
   rails (= 8.0.3)
   rspec-rails (= 8.0.0)
   sass-rails (= 6.0.0)