Resolve base issues

[kurtmckee]

Note

This fixes documentation build failures on Read the Docs.

Documentation

• Fix failing documentation builds (locally, and in Read the Docs).
• Enforce reproducible documentation builds using full dependency locking.
• Bump the OpenAPI documentation version and build the documentation.

Development

• Test documentation builds in GitHub CI.

Dependencies

• Manage test, mypy, and doc dependencies using a consistent framework.
• Introduce a standard tox -m update that can update dependencies.