Update github-administration.md

[kgangulyvibe]

Which feature of GitHub scan your repo and alerts you in case of detected vulnerabilities in your dependencies -> Dependabot alerts

[marchalvincent]

Up !
I agree with the new answer. Dependabot is the appropriate answer as security advisories is a private space to discuss and fix vulnerabilities : https://docs.github.com/en/code-security/security-advisories/working-with-repository-security-advisories/about-repository-security-advisories

[lgmorand]

@kgangulyvibe please do the same PR to the original repo and I will gadly accept your PR :)

https://github.com/lgmorand/github-certification-preparation-guide