The URL to use to access the dependencies in this registry. The protocol is optional. If not
specified, 'https://' is assumed. Dependabot adds or ignores trailing slashes as required.
For registries with type: python-index, if the boolean value is true, pip resolves dependencies by
using the specified URL rather than the base URL of the Python Package Index (by default
https://pypi.org/simple).
Identifies the type of registry.