Add redirect for "About GitHub dependabot"

Author: shati-patel

content/github/administering-a-repository/about-dependabot-version-updates.md

@@ -3,6 +3,7 @@ title: About Dependabot version updates
 intro: 'You can use {% data variables.product.prodname_dependabot %} to keep the packages you use updated to the latest versions.'
 redirect_from:
   - /github/administering-a-repository/about-dependabot
+  - /github/administering-a-repository/about-github-dependabot
   - /github/administering-a-repository/about-github-dependabot-version-updates
 
 versions: