Direct URL dependencies
https://setuptools.pypa.io/en/latest/userguide/dependency_management.html#direct-url-dependencies
Dependencies that are not available on a package index but can be downloaded elsewhere in the form of a source repository or archive may be specified
例
"Package-A @ git+https://example.net/package-a.git@main"
URLの書き方の参考:
VCS Support (pip)
Direct references (PEP 440)
も参照