* github_app_access_token: add support for GitHub Enterprise Server (#10879)
Add option to specify api endpoint for a GitHub Enterprise Server.
If option is not specified, defaults to https://api.github.com.
* refactor: apply changes as suggested by felixfontein
* docs: fix nox check error and type-o
nox check: plugins/lookup/github_app_access_token.py:57:1: DOCUMENTATION: error: too many blank lines (1 > 0) (empty-lines)
* refactor: apply changes as suggested by russoz
* refactor: apply changes as suggested by felixfontein
