chore: Require sphinx-rtd-theme of v1.3.0+

[matthewfeickert]

Description

• Now that sphinx-rtd-theme v1.3.0 is out set the lower required bound to v1.3.0 instead of the release candidate.

Checklist Before Requesting Reviewer

• Tests are passing
• "WIP" removed from the title of the pull request
• Selected an Assignee for the PR to be responsible for the log summary

Before Merging

For the PR Assignees:

• Summarize commit messages into a comprehensive review of the PR

* Now that sphinx-rtd-theme v1.3.0 is out set the lower required bound
  to v1.3.0 instead of the release candidate.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (d9b079f) 98.30% compared to head (3cdbdac) 98.30%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2309   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files          69       69           
  Lines        4536     4536           
  Branches      802      802           
=======================================
  Hits         4459     4459           
  Misses         45       45           
  Partials       32       32           

Flag	Coverage Δ
contrib	97.88% <ø> (ø)
doctest	61.04% <ø> (ø)
unittests-3.10	96.31% <ø> (ø)
unittests-3.11	96.31% <ø> (ø)
unittests-3.8	96.34% <ø> (ø)
unittests-3.9	96.36% <ø> (ø)

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