Bump puma from 3.12.6 to 4.3.8 (#2722)

Bumps [puma](https://github.com/puma/puma) from 3.12.6 to 4.3.8.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](https://github.com/puma/puma/compare/v3.12.6...v4.3.8)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ahmad Farhat <ahmad.af.farhat@gmail.com>

Gemfile

@@ -33,7 +33,7 @@ gem 'omniauth_openid_connect', '~> 0.3.5'
 gem 'omniauth-twitter', '~> 1.4.0'
 gem 'pagy', '~> 3.11.0'
 gem 'pluck_to_hash', '~> 1.0.2'
-gem 'puma', '~> 3.12.6'
+gem 'puma', '~> 4.3.8'
 gem 'rails', '~> 5.2.6'
 gem 'random_password', '~> 0.1.1'
 gem "recaptcha", '~> 5.7.0'