Raise bounds on Cassette & CuArrays

[mcabbott]

This allows Cassette 0.3 and CuArrays 2, and its friends, after which tests still pass on Julia 1.4.

Tests still fail on nightly, the message I get is this:

grad: basic: Error During Test at /Users/me/.julia/dev/Yota/test/test_grad.jl:8
  Got exception outside of a @test
  TypeError: in new, expected Union{Nothing, Symbol}, got a value of type String
  Stacktrace:
   [1] LineNumberNode(::Int64, ::Any) at ./boot.jl:372
   [2] generate_function_expr(::Tape) at /Users/me/.julia/dev/Yota/src/compile.jl:127
   [3] compile(::Tape; bind::Bool, ret_grad::Bool) at /Users/me/.julia/dev/Yota/src/compile.jl:182
   [4] compile(::Tape) at /Users/me/.julia/dev/Yota/src/compile.jl:182
   [5] compile!(::Tape) at /Users/me/.julia/dev/Yota/src/compile.jl:188
   [6] grad(::Function, ::Array{Float64,2}, ::Vararg{Any,N} where N; dynamic::Bool) at /Users/me/.julia/dev/Yota/src/grad.jl:316

[dfdx]

Perfect, thank you!
Regarding error on nightly, I think I know the reason and it should be easily fixable, I'll check it later today.

[dfdx]

Just FYI: I fixed an error on Julia nightly and submitted PR for a new version, thanks again for fixing dependency versions.

[mcabbott]

Sounds good!