Bump sphinx-rtd-theme from 1.3.0rc1 to 2.0.0rc2 #1255

Job	Run time
Mypy (static type checker)	49s
Linters	1m 13s
Documentation link check	48s
Build documentation	46s
Packaging	27s
Py:3.7 - Tw:21.2 - ubuntu-latest	50s
Py:3.7 - Tw:22.1 - ubuntu-latest	57s
Py:3.7 - Tw:current - ubuntu-latest	43s
Py:3.9 - Tw:21.2 - ubuntu-latest	1m 5s
Py:3.9 - Tw:22.1 - ubuntu-latest	1m 9s
Py:3.9 - Tw:current - ubuntu-latest	1m 8s
Py:3.10 - Tw:21.2 - ubuntu-latest	59s
Py:3.10 - Tw:22.1 - ubuntu-latest	1m 8s
Py:3.10 - Tw:current - ubuntu-latest	55s
Py:3.11 - Tw:21.2 - ubuntu-latest	58s
Py:3.11 - Tw:22.1 - ubuntu-latest	53s
Py:3.11 - Tw:current - ubuntu-latest	1m 4s
Py:pypy-3.8 - Tw:current - ubuntu-latest	1m 42s
Py:pypy-3.9 - Tw:current - ubuntu-latest	1m 26s
Py:3.12.0-alpha.7 - Tw:current - ubuntu-latest	1m 21s
klein-required	1s
	20m 22s

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