[EN-8798] [PythonAPI] Lock the Сython version #37

Job	Run time
installation (ubuntu-20.04, 3.7)	2m 40s
installation (ubuntu-20.04, 3.8)	1m 5s
installation (ubuntu-20.04, 3.9)	1m 15s
installation (ubuntu-latest, 3.7)	3m 39s
installation (ubuntu-latest, 3.8)	1m 16s
installation (ubuntu-latest, 3.9)	1m 33s
installation (windows-latest, 3.7)	3m 43s
installation (windows-latest, 3.8)	2m 19s
installation (windows-latest, 3.9)	3m 57s
installation (macos-latest, 3.7)	4m 13s
installation (macos-latest, 3.8)	2m 7s
installation (macos-latest, 3.9)	2m 1s
tests (ubuntu-20.04, 3.7)	7m 8s
tests (ubuntu-20.04, 3.8)	6m 14s
tests (ubuntu-20.04, 3.9)	5m 37s
tests (ubuntu-latest, 3.7)	7m 47s
tests (ubuntu-latest, 3.8)	5m 45s
tests (ubuntu-latest, 3.9)	5m 47s
tests (windows-latest, 3.7)	4m 25s
tests (windows-latest, 3.8)	2m 23s
tests (windows-latest, 3.9)	3m 18s
tests (macos-latest, 3.7)	4m 33s
tests (macos-latest, 3.8)	2m 1s
tests (macos-latest, 3.9)	2m 2s
	1h 26m 48s

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