Obviously, you only can do this for your own sites.
You need to authenticate a domain you want to remove content from via Webmaster Tools.

Rails Long Term Support

Rails LTS provides security patches for old versions of Ruby on Rails (2.3, 3.2, 4.2 and 5.2)

• Prevents you from data breaches and liability risks
• Upgrade at your own pace
• Works with modern Rubies

Read more Show archive.org snapshot

To remove a URL:

1. Open Webmaster Tools Show archive.org snapshot
2. Select the respective site from the list of domains under your control
3. Choose "Google Index" from the menu left
4. Click "Remove URL"