Merge pull request #394 from bugsnag/utcnow-deprecated #939

Job	Run time
test (3.8, ubuntu-latest)	4m 45s
test (3.9, ubuntu-latest)	4m 39s
test (3.10, ubuntu-latest)	4m 12s
test (3.11, ubuntu-latest)	2m 48s
test (3.12, ubuntu-latest)	3m 36s
test (3.13, ubuntu-latest)	3m 55s
test (3.5, ubuntu-20.04, pypi.python.org pypi.org files.pythonhosted.org)	6m 8s
test (3.6, ubuntu-20.04)	6m 43s
test (3.7, ubuntu-22.04)	6m 22s
Finish Coveralls processing	0s
	43m 8s

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