Update bug report templates

Bump gem version to 6.0.0.rc1.

guides/bug_report_templates/action_controller_gem.rb

@@ -8,7 +8,7 @@ gemfile(true) do
   git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
   # Activate the gem you are reporting the issue against.
-  gem "rails", "5.2.0"
+  gem "rails", "6.0.0.rc1"
 end
 
 require "rack/test"

guides/bug_report_templates/active_job_gem.rb

@@ -8,7 +8,7 @@ gemfile(true) do
   git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
   # Activate the gem you are reporting the issue against.
-  gem "activejob", "5.2.0"
+  gem "activejob", "6.0.0.rc1"
 end
 
 require "minitest/autorun"

guides/bug_report_templates/active_record_gem.rb

@@ -8,8 +8,8 @@ gemfile(true) do
   git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
   # Activate the gem you are reporting the issue against.
-  gem "activerecord", "5.2.0"
-  gem "sqlite3", "~> 1.3.6"
+  gem "activerecord", "6.0.0.rc1"
+  gem "sqlite3"
 end
 
 require "active_record"

guides/bug_report_templates/active_record_migrations_gem.rb

@@ -8,8 +8,8 @@ gemfile(true) do
   git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
   # Activate the gem you are reporting the issue against.
-  gem "activerecord", "5.2.0"
-  gem "sqlite3", "~> 1.3.6"
+  gem "activerecord", "6.0.0.rc1"
+  gem "sqlite3"
 end
 
 require "active_record"
@@ -29,7 +29,7 @@ end
 class Payment < ActiveRecord::Base
 end
 
-class ChangeAmountToAddScale < ActiveRecord::Migration[5.2]
+class ChangeAmountToAddScale < ActiveRecord::Migration[6.0]
   def change
     reversible do |dir|
       dir.up do

guides/bug_report_templates/generic_gem.rb

@@ -8,7 +8,7 @@ gemfile(true) do
   git_source(:github) { |repo| "https://github.com/#{repo}.git" }
 
   # Activate the gem you are reporting the issue against.
-  gem "activesupport", "5.2.0"
+  gem "activesupport", "6.0.0.rc1"
 end
 
 require "active_support"