CompatHelper: bump compat for Functors to 0.5, (keep existing compat) #726

Job	Run time
test (1.6, ubuntu-latest, x64, ForwardDiff)	7m 0s
test (1.6, ubuntu-latest, x64, Tracker)	6m 41s
test (1.6, ubuntu-latest, x64, ReverseDiff)	7m 2s
test (1.6, ubuntu-latest, x64, Zygote)	7m 49s
test (1.6, macOS-latest, x64, ForwardDiff)	7m 42s
test (1.6, macOS-latest, x64, Tracker)	7m 38s
test (1.6, macOS-latest, x64, ReverseDiff)	10m 18s
test (1.6, macOS-latest, x64, Zygote)	9m 20s
test (1, ubuntu-latest, x64, Enzyme)	9m 46s
test (1, ubuntu-latest, x64, ForwardDiff)	9m 37s
test (1, ubuntu-latest, x64, Mooncake)	9m 40s
test (1, ubuntu-latest, x64, Tracker)	8m 27s
test (1, ubuntu-latest, x64, ReverseDiff)	9m 5s
test (1, ubuntu-latest, x64, Zygote)	9m 32s
test (1, macOS-latest, x64, Enzyme)	12m 46s
test (1, macOS-latest, x64, ForwardDiff)	9m 56s
test (1, macOS-latest, x64, Mooncake)	12m 10s
test (1, macOS-latest, x64, Tracker)	10m 10s
test (1, macOS-latest, x64, ReverseDiff)	11m 6s
test (1, macOS-latest, x64, Zygote)	11m 31s
	3h 7m 16s

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