Allow to use 0.7.x version of DifferentiationInterface.jl

[pjssilva]

The current compat of the package is

              julia                    1.6
   [47edcb42] ADTypes                  1.5.3
   [a0c0ee7d] DifferentiationInterface 0.6.2
   [37e2e46d] LinearAlgebra            1.2
   [de0858da] Printf                   1.2
   [dc4f5ac2] ProximalCore             0.1

The restriction on DifferentiationInterface.jl precludes using version 0.7.x that is required by other packages (like version 2.x of Optimjl). I tested ProximalAlgorithms.jl, changing compat to

              julia                    1.6
   [47edcb42] ADTypes                  1.5.3
   [a0c0ee7d] DifferentiationInterface 0.6.2,0.7
   [37e2e46d] LinearAlgebra            1.2
   [de0858da] Printf                   1.2
   [dc4f5ac2] ProximalCore             0.1

All tests passed. Hence, it seems possible to use 0.7.x version of DifferentiationInterface.jl.

[lostella]

Thanks @pjssilva!