remove redundant greenlet dependency #134

Job	Run time
unit-tests (3.7, ubuntu-22.04)	3m 25s
unit-tests (3.7, macOS-latest)	5s
unit-tests (3.7, windows-latest)	6m 54s
unit-tests (3.8, ubuntu-22.04)	3m 13s
unit-tests (3.8, macOS-latest)	3m 36s
unit-tests (3.8, windows-latest)	5m 52s
unit-tests (3.9, ubuntu-22.04)	3m 11s
unit-tests (3.9, macOS-latest)	19s
unit-tests (3.9, windows-latest)	5m 48s
unit-tests (3.10, ubuntu-22.04)	2m 58s
unit-tests (3.10, macOS-latest)	18s
unit-tests (3.10, windows-latest)	7m 24s
unit-tests (3.11, ubuntu-22.04)	3m 9s
unit-tests (3.11, macOS-latest)	21s
unit-tests (3.11, windows-latest)	5m 47s
unit-tests (3.12-dev, ubuntu-22.04)	3m 13s
unit-tests (3.12-dev, macOS-latest)	22s
unit-tests (3.12-dev, windows-latest)	6m 23s
unit-tests (pypy-3.8, ubuntu-22.04)	5m 55s
unit-tests (pypy-3.8, macOS-latest)	5m 25s
unit-tests (pypy-3.8, windows-latest)	10m 11s
unit-tests (pypy-3.9, ubuntu-22.04)	5m 31s
unit-tests (pypy-3.9, macOS-latest)	5m 8s
unit-tests (pypy-3.9, windows-latest)	9m 29s
unit-tests (pypy-3.10, ubuntu-22.04)	5m 31s
unit-tests (pypy-3.10, macOS-latest)	4m 20s
unit-tests (pypy-3.10, windows-latest)	9m 16s
publish-docker-image	0s
	2h 3m 4s

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