Avoid using latest cmake from PyPI, as setuptools-scm generated type … #640

Job	Run time
Python 2.7 • ubuntu-20.04	8s
Python 3.5 • ubuntu-20.04	6m 27s
Python 3.6 • ubuntu-20.04	6m 32s
Documentation	6h 0m 14s
Python 3.7 • ubuntu-20.04	6m 16s
Python 3.8 (with Praat tests) • ubuntu-20.04	6m 27s
Python 3.9 • ubuntu-20.04	6m 38s
Python 3.10 • ubuntu-20.04	6m 31s
Python pypy-2.7 • ubuntu-20.04	7m 45s
Python pypy-3.6 (with Praat tests) • ubuntu-20.04	21m 26s
Python pypy-3.7 • ubuntu-20.04	6m 28s
Python 3.8 (GCC 10) • ubuntu-20.04	5m 52s
Python 3.8 (Clang 12) • ubuntu-20.04	5m 54s
Python 2.7 (Release) • ubuntu-20.04	9s
Python 3.8 (Release) • ubuntu-20.04	7m 58s
Python 2.7 • macos-11	13s
Python 3.8 (with Praat tests) • macos-11	11m 34s
Python 3.8 (Release) • macos-11	14m 52s
Python pypy-3.6 • macos-11	29s
Python 2.7 • windows-2019	26s
Python 3.8 (with Praat tests) • windows-2019	16m 36s
Python 2.7 (32-bit) • windows-2019	21s
Python 3.8 (32-bit) • windows-2019	14m 16s
Python 3.8 (Release) • windows-2019	15m 0s
Python pypy-3.6 • windows-2019	19m 4s
	9h 7m 36s

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