Support for GHES

[x3dfxjunkie]

Is your feature request related to a problem? Please describe.
In the overview section, public and private (cloud) repos are able to use this action, but GHES is not listed. Additionally, when trying to run this in our environment, the link stating that our repo is not supported is hard-coded to https://github.com.

Error: Dependency review is not supported on this repository. Please ensure that Dependency graph is enabled along with GitHub Advanced Security on private repositories, see https://github.com/<ORG>/<REPO>/settings/security_analysis

This is not reflecting the reality that our GitHub repo is actually at https://github.<COMPANY>.com/<ORG>/<REPO>/

Describe the solution you'd like
We would love the ability to use this in our environment, as we do with many of the current GitHub actions. Either add support or documentation specific to enabling support on GHES hosted repos.

Additional context
We are currently using GitHub Enterprise Server 3.11.2, which has support for GitHub Advanced Security.

[github-actions]

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