Update tests for PL 0.31 to remove deprecated functions

[multiphaseCFD]

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Context:

PennyLane v0.30.0-dev has removed support for previously deprecated functions, as defined in https://docs.pennylane.ai/en/stable/development/deprecations.html. This PR updates those functions to the new supported syntax.

Description of the Change:

As above. In addition, due to an ongoing issue with RTD builds using unaligned versions of setuptools and pip, we create a subtle change to the RTD builder to fix the package versions until readthedocs/readthedocs.org#10287 becomes usable. In addition, to avoid CI issues, CYBot is now GHBot and will auto-update the package versions in the CI.

Benefits:

Possible Drawbacks:

Related GitHub Issues:

[vincentmr]

Looks good to me. Thanks @multiphaseCFD