fix Gemfile for propshaft

Author: westonganger

Gemfile

@@ -22,7 +22,7 @@ rails_version = get_env("RAILS_VERSION")
 
 gem "rails", rails_version
 
-if rails_version.nil? || rails_version.to_f >= 8.0
+if rails_version.nil? || rails_version.sub("~>","").to_f >= 8.0
   gem "propshaft"
 else
   gem 'sprockets-rails', require: 'sprockets/railtie'