readthedocs: autodoc fails for o3api

During the automatic build at readthedocs, autodoc for o3api fails:

WARNING: autodoc: failed to import module 'o3api'; the following exception was raised:
cannot import name 'escape' from 'jinja2' (/home/docs/checkouts/readthedocs.org/user_builds/o3as/envs/latest/lib/python3.8/site-packages/jinja2/__init__.py)

(repeats five more times)

Possible mismatch between Sphinx and Jinja versions, e.g. github issue

Though versions used at readthedocs:

Sphinx v5.0.2
Jinja2-3.1.2

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