chore: bump compat for Flux in [weakdeps] to 0.16, (keep existing com… #3868

Job	Run time
test (1.10, ubuntu-latest, core_layers)	17m 52s
test (1.10, ubuntu-latest, normalize_layers)	18m 23s
test (1.10, ubuntu-latest, recurrent_layers)	27m 47s
downgrade	0s
test (1.10, ubuntu-latest, autodiff)	48m 28s
test (1.10, ubuntu-latest, misc)	27m 39s
test (1.10, ubuntu-latest, reactant)	13m 39s
test (1, ubuntu-latest, core_layers)	19m 53s
test (1, ubuntu-latest, normalize_layers)	19m 59s
test (1, ubuntu-latest, recurrent_layers)	32m 13s
test (1, ubuntu-latest, autodiff)	31m 11s
test (1, ubuntu-latest, misc)	30m 34s
test (1, ubuntu-latest, reactant)	18m 8s
test (1, macos-latest, all)	6h 0m 18s
test (1, windows-latest, all)	1h 33m 34s
	12h 39m 38s

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