Cirq v1.4.1 release

Patch release which updates cirq-rigetti to use pyquil v4 and fixes
documentation build problems due to conflicting requirements per #6500.

Patches included w/r to v1.4.0

9bf365e Improve replace_version tool and development wheels (#6626)
e228340 Make implicit Optional type hints in Quantum Engine PEP 484 compliant (#6640)
6f5b4b2 Update cirq-rigetti to use pyquil v4 (#6281)
d38f24a Update requirements.txt (#6633)
4112b59 CI - add Python 3.12 tests to ci-daily (#6605)
b0e5b1d Fix CI lint failure by pinning to protobuf-4 (#6650)
2975d10 Bump cirq version to 1.4.1