Use pytest<8 for now, until pytest-lazy-fixtures gets fixed or replaced #643

Job	Run time
Documentation	8m 17s
Python 2.7 • ubuntu-20.04	37s
Python 3.5 • ubuntu-20.04	6m 20s
Python 3.6 • ubuntu-20.04	6m 25s
Python 3.7 • ubuntu-20.04	6m 19s
Python 3.8 (with Praat tests) • ubuntu-20.04	21m 16s
Python 3.9 • ubuntu-20.04	6m 27s
Python 3.10 • ubuntu-20.04	6m 37s
Python pypy-2.7 • ubuntu-20.04	7m 47s
Python pypy-3.6 (with Praat tests) • ubuntu-20.04	21m 47s
Python pypy-3.7 • ubuntu-20.04	6m 56s
Python 3.8 (GCC 10) • ubuntu-20.04	5m 48s
Python 3.8 (Clang 12) • ubuntu-20.04	6m 6s
Python 2.7 (Release) • ubuntu-20.04	34s
Python 3.8 (Release) • ubuntu-20.04	7m 49s
Python 2.7 • macos-11	5m 24s
Python 3.8 (with Praat tests) • macos-11	27m 20s
Python 3.8 (Release) • macos-11	15m 18s
Python pypy-3.6 • macos-11	33s
Python 2.7 • windows-2019	2m 5s
Python 3.8 (with Praat tests) • windows-2019	37m 18s
Python 2.7 (32-bit) • windows-2019	1m 40s
Python 3.8 (32-bit) • windows-2019	15m 16s
Python 3.8 (Release) • windows-2019	14m 13s
Python pypy-3.6 • windows-2019	18m 54s
	4h 17m 6s

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