test_ninja_rebuilds fails due to file modification race condition?

[jgoeders]

The test_ninja_rebuilds test case has been disabled (

bfasst/test/scripts/test_ninja_flow_manager.py

Lines 124 to 125 in e8b1db8

	# This is disabled right now because it seems to be failing due
	# to file modification time race conditions

) since I can't get it to pass CI.

The failures seem non-deterministic and possibly related to file modification time race conditions. I can get the test to pass locally by adding some sleep statements, but this isn't working on the CI.