Enhanced warning messages for the bundled gems

[hsbt]

What was the end-user or developer problem that led to this PR?

see https://bugs.ruby-lang.org/issues/19846

What is your fix for the problem, implemented in this PR?

I added two extra warning features for the bundled gems.

• Update correct warnings message each Ruby version.
• Suggest to contact for gem authors if users didn't use gem directly.

Make sure the following tasks are checked

• Describe the problem / feature
• Write tests for features and bug fixes
• Write code to solve the problem
• Make sure you follow the current code style and write meaningful commit messages without tags