Pin mongomock (#934) #53

Job	Run time
setup (ubuntu-latest)	27s
test_pre_commit	21s
setup (windows-latest)	1m 52s
pytest (3.8, py38, ubuntu-latest)	1m 13s
coverage	1m 21s
setup (macos-latest)	26s
pytest (3.8, py38, windows-latest)	3m 24s
pytest (3.8, py38, macos-latest)	2m 29s
pytest (3.9, py39, ubuntu-latest)	1m 14s
pytest (3.9, py39, windows-latest)	2m 43s
pytest (3.9, py39, macos-latest)	1m 14s
pytest (3.10, py310, ubuntu-latest)	1m 4s
pytest (3.10, py310, windows-latest)	2m 33s
pytest (3.10, py310, macos-latest)	1m 0s
pytest (3.11, py311, ubuntu-latest)	1m 10s
pytest (3.11, py311, windows-latest)	2m 32s
pytest (3.11, py311, macos-latest)	1m 3s
pytest (ubuntu-latest, 3.8, tensorflow-27)	1m 14s
pytest (ubuntu-latest, 3.9, tensorflow-28)	1m 19s
pytest (ubuntu-latest, 3.10, tensorflow-29)	1m 8s
pytest (ubuntu-latest, 3.10, tensorflow-210)	1m 7s
pytest (ubuntu-latest, 3.10, tensorflow-211)	1m 5s
pytest (ubuntu-latest, 3.9, numpy-120)	54s
pytest (ubuntu-latest, 3.10, numpy-121)	47s
pytest (ubuntu-latest, 3.10, numpy-123)	47s
pytest (ubuntu-latest, 3.11, numpy-124)	43s
	35m 10s

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