installation fails on python 3.13

[richrines1]

Description of the issue

both cirq_google (dev version only) and cirq_rigetti (both dev and production versions) are currently failing to install on python 3.13

How to reproduce the issue

all of the following fail in a python 3.13 env:

pip install cirq_google==1.5.0.dev20250107193327  # ERROR: No matching distribution found for typedunits
pip install cirq_google==1.5.0.dev20250107193327  # ....metadata-generation-failed
pip install cirq_rigetti==1.4.1  # ....metadata-generation-failed

Cirq version

1.5.0.dev20250107193327 (both cirq_google and cirq_rigetti)
1.4.1 (cirq_rigetti only)

[maffoo]

I filed an issue for typedunits: quantumlib/TypedUnits#26. Not sure what needs to be done for cirq_rigetti.