fix: broken configuration for readthedocs

[dklimpel]

Part of:

• Published documentation is out-of-date #532

Follow up to:

• Use extra requirements to build readthedocs #546

Docs and example: https://docs.readthedocs.com/platform/stable/config-file/v2.html#packages

Current failure: https://app.readthedocs.org/projects/podman-py/builds/28555767/

Config file validation error Config validation error in python.install. Expected a list, got type dict ({'path': '.', 'method': 'pip', 'extra_requirements': ['docs']}).

[openshift-ci]

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[dklimpel]

/assign jwhonce