Bump puma from 4.3.12 to 6.4.0

Bumps [puma](https://github.com/puma/puma) from 4.3.12 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@v4.3.12...v6.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Gemfile

@@ -10,7 +10,7 @@ gem 'rails', '~> 6.1'
 # Use postgresql as the database for Active Record
 gem 'pg', '>= 0.18', '< 2.0'
 # Use Puma as the app server
-gem 'puma', '~> 4.3.12'
+gem 'puma', '~> 6.4.0'
 # Use Redis adapter to run Action Cable in production
 # gem 'redis', '~> 4.0'
 # Use Active Model has_secure_password

Gemfile.lock

@@ -176,7 +176,7 @@ GEM
       coderay (~> 1.1)
       method_source (~> 1.0)
     public_suffix (5.0.1)
-    puma (4.3.12)
+    puma (6.4.0)
       nio4r (~> 2.0)
     pundit (2.3.0)
       activesupport (>= 3.0.0)
@@ -312,7 +312,7 @@ DEPENDENCIES
   net-pop
   net-smtp
   pg (>= 0.18, < 2.0)
-  puma (~> 4.3.12)
+  puma (~> 6.4.0)
   pundit (~> 2.2)
   rack-cors
   rails (~> 6.1)