Don't error if turbo-rails is required on an unsupported Rails version

Author: boardfish

Gemfile.lock

@@ -308,6 +308,10 @@ GEM
     thor (1.3.1)
     tilt (2.4.0)
     timeout (0.4.1)
+    turbo-rails (1.5.0)
+      actionpack (>= 6.0.0)
+      activejob (>= 6.0.0)
+      railties (>= 6.0.0)
     tzinfo (2.0.6)
       concurrent-ruby (~> 1.0)
     unicode-display_width (2.5.0)
@@ -355,6 +359,7 @@ DEPENDENCIES
   slim (~> 5.1)
   sprockets-rails (~> 3.4.2)
   standard (~> 1)
+  turbo-rails (~> 1)
   view_component!
   warning
   yard (~> 0.9.34)

test/sandbox/config/application.rb

@@ -7,6 +7,11 @@
 require "action_mailer/railtie"
 require "action_view/railtie"
 require "sprockets/railtie"
+begin
+  require "turbo-rails"
+rescue LoadError
+  raise if Rails::VERSION::MAJOR >= 6
+end
 
 # Track when different Rails frameworks get loaded.
 # Ideally, none of them should be loaded until after initialization is complete.