Replace deprecated datetime.utcnow (backport #5702) #4042

Job	Run time
Pre-commit checks	2m 25s
Build Documentation (f40)	1m 24s
Integration Tests (f40)	8m 7s
Build Documentation (f41)	1m 34s
Integration Tests (f41)	7m 33s
Build Documentation (pip)	2m 26s
Build the RPMS (f40)	1m 26s
Integration Tests (rawhide)	7m 19s
Build Documentation (rawhide)	1m 20s
Build the RPMS (f41)	1m 26s
Build the RPMS (rawhide)	1m 16s
Unit Tests (f40, bodhi-client)	1m 11s
Unit Tests (f40, bodhi-messages)	1m 4s
Unit Tests (f40, bodhi-server)	4m 6s
Unit Tests (f41, bodhi-client)	1m 15s
Unit Tests (f41, bodhi-messages)	1m 8s
Unit Tests (f41, bodhi-server)	3m 25s
Unit Tests (pip, bodhi-client)	2m 20s
Unit Tests (pip, bodhi-messages)	2m 15s
Unit Tests (pip, bodhi-server)	4m 47s
Unit Tests (rawhide, bodhi-client)	1m 35s
Unit Tests (rawhide, bodhi-messages)	1m 7s
Unit Tests (rawhide, bodhi-server)	3m 58s
Diff-cover check	16s
	1h 4m 43s

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