Allow Sphinx 3.4

[altendky]

Draft for:

• A fix in the case that this is not deemed a Sphinx bug

[codecov]

Codecov Report

Merging #196 (641c596) into master (6fdcc10) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #196   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           29        29           
  Lines         1500      1500           
  Branches        77        77           
=========================================
  Hits          1500      1500           

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[altendky]

Looks to be an unintended change in Sphinx behavior (sphinx-doc/sphinx#8602 (comment)) but I'll keep this open for now.

[altendky]

Nope, Sphinx put in a fix.