Remove Base.parameter_upper_bound given removal from Base #757
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Base.parameter_upper_bound
has been removed on julia master, so was breaking Flux on julia master.It doesn't seem to be mentioned anywhere other than this in Zygote
I couldn't find where it left base, but perhaps it wasn't intended to be used anyway given JuliaLang/julia#36769 (comment)
I can't vouch for just deleting this being a good idea, other than I couldn't find any other mention in the Zygote source, but either way it needs fixing