remove redundant greenlet dependency #140

Job	Run time
unit-tests (3.8, ubuntu-22.04)	2m 53s
unit-tests (3.8, windows-latest)	3m 15s
unit-tests (3.9, ubuntu-22.04)	2m 41s
unit-tests (3.9, windows-latest)	3m 32s
unit-tests (3.10, ubuntu-22.04)	2m 41s
unit-tests (3.10, macOS-latest)	3m 3s
unit-tests (3.10, windows-latest)	3m 20s
unit-tests (3.11, ubuntu-22.04)	2m 41s
unit-tests (3.11, macOS-latest)	3m 9s
unit-tests (3.11, windows-latest)	3m 26s
unit-tests (3.12, ubuntu-22.04)	2m 46s
unit-tests (3.12, macOS-latest)	3m 5s
unit-tests (3.12, windows-latest)	3m 25s
unit-tests (pypy-3.8, ubuntu-22.04)	3m 37s
unit-tests (pypy-3.8, macOS-latest)	4m 7s
unit-tests (pypy-3.8, windows-latest)	6m 37s
unit-tests (pypy-3.9, ubuntu-22.04)	3m 29s
unit-tests (pypy-3.9, macOS-latest)	3m 54s
unit-tests (pypy-3.9, windows-latest)	4m 37s
unit-tests (pypy-3.10, ubuntu-22.04)	3m 37s
unit-tests (pypy-3.10, macOS-latest)	4m 0s
unit-tests (pypy-3.10, windows-latest)	5m 25s
unit-tests (3.8, macos-13)	3m 21s
unit-tests (3.9, macos-13)	3m 12s
publish-docker-image	55s
	1h 26m 48s

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