Allow for proposed new parsing of array[end] in Setfield

[mlechu]

This is essentially the same change as JuliaObjects/Accessors.jl#196. Description copied below:

To fix JuliaLang/julia#57269, a small-but-breaking AST change is needed (PR JuliaLang/julia#57368). The set macro in Setfield and Accessors breaks, and enough packages depend on this macro that it needs to be updated before deciding whether to merge the julialang PR.

This PR only recognizes the new way of parsing array[end], and should not change any behaviour when used with the current parser.

[jw3126]

JuliaObjects/Accessors.jl#196

[topolarity]

The Accessors change has now merged - Anything else needed here @jw3126 ?