Allow ForwardDiff v1

[mcabbott]

No description provided.

[longemen3000]

hmm, seems the tests are failing because of the cache actions.

[ThummeTo]

fixed the workflow, can you check if everything works as to expect (besides the test script). If yes, we can make a v0.3.0 :-)

[mcabbott]

I presume that if tests pass this is safe.

The breaking change on ForwardDiff v1 is that Dual(x, dx) == y requires not only x==y but also dx==0 now. I think this package need not care, i.e. there's no change to the types etc, only to the mathematics.

[baggepinnen]

Friendly bump, I have some packages that are waiting for this :)

[ThummeTo]

Registration is running :-)