🧪 TESTS: Fix test failure with Sphinx 4.5

[mitya57]

See sphinx-doc/sphinx#10288.

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@@            Coverage Diff            @@
##             master     #542   +/-   ##
=========================================
  Coverage          ?   89.78%           
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  Files             ?       16           
  Lines             ?     2104           
  Branches          ?        0           
=========================================
  Hits              ?     1889           
  Misses            ?      215           
  Partials          ?        0           

Flag	Coverage Δ
pytests	89.78% <ø> (?)

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[chrisjsewell]

Cheers! (the python 3 issue I'll fix separately)

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