chore: bump compat for Flux in [weakdeps] to 0.16, (keep existing com… #248

Job	Run time
downgrade	0s
test (1, ubuntu-latest, conv, default, true)	26m 25s
test (1, ubuntu-latest, dense, default, true)	22m 34s
test (1, ubuntu-latest, normalization, default, true)	1h 8m 47s
test (1, ubuntu-latest, misc, default, true)	36m 34s
test (1, ubuntu-latest, dense, default, false)	19m 49s
test (1, ubuntu-latest, misc, default, false)	28m 36s
test (1, macos-latest, all, default, true)	4h 52m 43s
test (1, windows-latest, all, default, true)	1h 53m 39s
	10h 9m 7s

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