Add sphinx-rtd-theme package #1086

Job	Run time
test_c_linux (0, x64)	51s
test_c_linux (1, x64)	54s
mypy	16s
test_c_linux (0, x32)	1m 12s
build_python_27 (ubuntu-22.04, no)	2m 48s
test_c_linux (1, x32)	1m 18s
build_python_27 (windows-latest, yes)	3m 52s
build_python_27 (windows-latest, no)	4m 37s
test_c_windows (win32)	1m 11s
build_python_27 (ubuntu-22.04, yes)	2m 53s
test_c_windows (x64)	53s
build (3.11, yes, ubuntu-22.04)	4m 42s
build (3.9, no, ubuntu-22.04)	4m 59s
build (3.10, yes, ubuntu-22.04)	4m 43s
build (3.7, yes, ubuntu-22.04)	2m 47s
build (3.12, no, ubuntu-22.04)	4m 33s
build (3.10, no, ubuntu-22.04)	4m 50s
build (3.13, yes, ubuntu-22.04)	4m 35s
python_no_gil	5m 53s
build (3.9, yes, ubuntu-22.04)	4m 46s
build (3.8, no, ubuntu-22.04)	2m 36s
build (3.12, yes, ubuntu-22.04)	4m 29s
build (3.8, yes, ubuntu-22.04)	2m 22s
build (3.13, yes, windows-latest)	4m 12s
build (pypy2.7, no, ubuntu-latest)	1m 41s
build (3.13, no, ubuntu-22.04)	4m 37s
build (3.13, no, windows-latest)	4m 22s
build (3.13, yes, macos-13)	4m 56s
build (pypy3.9, no, ubuntu-latest)	4m 7s
build (3.11, no, ubuntu-22.04)	4m 33s
build (3.7, no, ubuntu-22.04)	2m 40s
build (3.13, yes, ubuntu-22.04-arm)	4m 53s
	1h 48m 1s

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