conf.py should always open files relative to script #848

Job	Run time
mypy	22s
sdist	41s
ruff	7s
tox (ubuntu-latest)	1m 26s
tox (windows-latest)	2m 34s
parse_sdl (windows-latest, 2.0.14)	1m 2s
linux-wheels (x86_64, cp38-manylinux*)	2m 9s
build (ubuntu-latest, 3.8, x64)	2m 52s
build-macos (cp38-*_universal2)	4m 52s
parse_sdl (windows-latest, 2.0.16)	52s
linux-wheels (x86_64, pp38-manylinux*)	2m 8s
parse_sdl (macos-latest, 2.0.14)	36s
linux-wheels (aarch64, cp38-manylinux*)	10m 28s
build-macos (cp38-*_x86_64)	3m 59s
build (ubuntu-latest, 3.9, x64)	3m 4s
parse_sdl (macos-latest, 2.0.16)	31s
linux-wheels (aarch64, pp38-manylinux*)	9m 4s
build-macos (cp38-*_arm64)	3m 28s
build (ubuntu-latest, pypy-3.8, x64)	2m 47s
build-macos (pp38-*)	3m 7s
build (windows-latest, 3.8, x64)	3m 10s
test-docs	1m 16s
build (windows-latest, 3.9, x64)	4m 1s
build (windows-latest, pypy-3.8, x64)	5m 42s
build (windows-latest, 3.8, x86)	3m 51s
build (windows-latest, pypy-3.8, x86)	4m 43s
publish	0s
	1h 18m 52s

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