Fix: Timeouts due to Heroku router v2

Because:
- https://blog.heroku.com/pumas-routers-keepalives-ohmy

Gemfile

@@ -34,7 +34,7 @@ gem 'pagy', '~> 9.0'
 gem 'pg', '~> 1.5'
 gem 'propshaft', '~> 0.9'
 gem 'public_activity', '~> 3.0'
-gem 'puma', '~> 6.4'
+gem 'puma', '~> 6.5'
 gem 'rack-attack', '~> 6.7'
 gem 'redis', '~> 5.3'
 gem 'rqrcode', '~> 2.2'

Gemfile.lock

@@ -364,7 +364,7 @@ GEM
       i18n (>= 0.5.0)
       railties (>= 6.1.0)
     public_suffix (6.0.1)
-    puma (6.4.3)
+    puma (6.5.0)
       nio4r (~> 2.0)
     raabro (1.4.0)
     racc (1.8.1)
@@ -632,7 +632,7 @@ DEPENDENCIES
   pg (~> 1.5)
   propshaft (~> 0.9)
   public_activity (~> 3.0)
-  puma (~> 6.4)
+  puma (~> 6.5)
   rack-attack (~> 6.7)
   rack-mini-profiler
   rails (= 7.1.3.4)

config/puma.rb

@@ -8,6 +8,7 @@
 
 port        ENV['PORT']     || 3000
 environment ENV['RACK_ENV'] || 'development'
+enable_keep_alives false
 
 on_worker_boot do
   # Worker specific setup for Rails 4.1+