Update deprecated gradient_kwargs usage

[andrijapau]

Context:

As of PennyLaneAI/pennylane#6828, gradient_kwargs is now a positional keyword argument for the QNode. This means you can not simply express,

qml.QNode(func, dev, h=1)

instead, you must deliberately specify,

qml.QNode(func, dev, gradient_kwargs={"h":1})

Description of the Change:

Updated any deprecated code that was found.

Benefits: Consistency with code-base.

Possible Drawbacks: None identified.

[sc-81531]

[joeycarter]

Thanks @andrijapau!

Generally speaking, we don't include changelog entries if the only changes were to tests. Feel free to keep your name in the contributors list though! 🚀

It may also be necessary to update the version of PennyLane in the .dep-versions file after the PL nightly release with the changes is available:

catalyst/.dep-versions

Line 11 in e50fd94

# pennylane=0.41.0-dev1

assuming the syntax qml.QNode(f, device, diff_method="finite-diff", h=0.1) is no longer supported.