fix RTD builds

[njzjz]

per readthedocs/readthedocs.org#10290 (comment)

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.11 ⚠️

Comparison is base (af6b72b) 82.76% compared to head (8bfa3de) 82.65%.

❗ Current head 8bfa3de differs from pull request most recent head 61f5efc. Consider uploading reports for the commit 61f5efc to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #468      +/-   ##
==========================================
- Coverage   82.76%   82.65%   -0.11%     
==========================================
  Files          70       70              
  Lines        6313     6286      -27     
==========================================
- Hits         5225     5196      -29     
- Misses       1088     1090       +2     

see 9 files with indirect coverage changes

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