Remove unnecessary rack-ssl gem

Rails comes with ActionDispatch::SSL which is enabled in staging and
production. We don't need this ancient gem last updated in 2014.

Gemfile

@@ -92,7 +92,6 @@ gem 'gmaps4rails'
 gem 'mimemagic', '> 0.3.5'
 gem 'paper_trail', '~> 12.1.0'
 gem 'rack-rewrite'
-gem 'rack-ssl', require: 'rack/ssl'
 gem 'roadie-rails'
 
 gem 'hiredis'

Gemfile.lock

@@ -495,8 +495,6 @@ GEM
     rack-proxy (0.7.0)
       rack
     rack-rewrite (1.5.1)
-    rack-ssl (1.4.1)
-      rack
     rack-test (2.0.2)
       rack (>= 1.3)
     rack-timeout (0.6.3)
@@ -846,7 +844,6 @@ DEPENDENCIES
   puma
   rack-mini-profiler (< 3.0.0)
   rack-rewrite
-  rack-ssl
   rack-timeout
   rails (>= 6.1.4)
   rails-controller-testing