Fix CI failure of Contract-a-Grid-Circuit.ipynb on Python 3.12

[pavoljuhas]

Description of the issue

The test_notebooks_against_cirq_head[.../quimb/Contract-a-Grid-Circuit.ipynb] fails mysteriously on the CI after bumping up requirements for compatibility with Python 3.12, but passes without a problem on a local Linux workstation.
To unblock the Python 3.12 compatibility the Contract-a-Grid-Circuit.ipynb is skipped in tests as of #6516.

This goal of this issue is to re-enable the notebook test and fix its failure on the CI runners.

How to reproduce the issue

$ check/pytest -s -n 0 -m slow dev_tools/notebooks/notebook_test.py -k Contract-a-Grid-Circuit

Cirq version

1.4.0.dev at 5a3cd55 of #6516