[Nonlinear.ReverseAD] Fix use of reinterpret instead _reinterpret_unsafe

[odow]

Introduced by #2736, specifically:

https://github.com/jump-dev/MathOptInterface.jl/pull/2736/files#diff-fd2e1ad4a6c5ea5294c6e338afffbb76c837b6c4a868d949007a0229ad846ec0R187

I found the test case by taking the failed Juniper run, and reducing.

[odow]

https://github.com/jump-dev/MathOptInterface.jl/actions/runs/14768059895

[blegat]

I copy-pasted from here but I guess it's correct because we use a chunk of on there

MathOptInterface.jl/src/Nonlinear/ReverseAD/mathoptinterface_api.jl

Lines 339 to 343 in e0d6bb3

	input_ϵ = reinterpret(T, d.input_ϵ)
	output_ϵ = reinterpret(T, d.output_ϵ)
	for i in 1:length(x)
	input_ϵ[i] = ForwardDiff.Partials((v[i],))
	end