CI: Doc build failing

[TomAugspurger]

Raw log: https://pipelines.actions.githubusercontent.com/xZyE9jtmkxWlfCAbyu1SHPJOlsa2huNFYcxohSTomy6EbdNZT9/_apis/pipelines/1/runs/25615/signedlogcontent/5?urlExpires=2020-04-06T15%3A02%3A02.2235397Z&urlSigningMethod=HMACV1&urlSignature=eEVJM7I2bg9PFf1apMIamBRrB1gG01K%2F12iKl%2Fe%2Bp5k%3D

2020-04-06T13:50:55.3962303Z looking for now-outdated files... none found
2020-04-06T13:50:55.6426712Z pickling environment... done
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2020-04-06T13:50:55.6468876Z checking consistency... done
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[TomAugspurger]

Sphinx 3.0.0 was released yesterday, so possibly related to that. But there are other PRs where this isn't an issue, also using 3.0.0. So it may not be deterministic.

[jorisvandenbossche]

This should have been fixed by #33309

[TomAugspurger]

Ah, thanks I missed that. I must have merged master just before it was merged.