Mark Backman 4088992d97 Relax protobuf pin to support both 5.x and 6.x runtimes ...

Pipecat 1.0.8 hard-required protobuf 6.x via the base `protobuf>=6.31.1,<7`
pin, blocking users whose dependency graph already constrains protobuf to
the 5.x line. The original bump (PR #4136) was only needed because
`nvidia-riva-client>=2.25.1` ships gencode compiled with protoc 6.31.1.

Changes:

- Widen base pin to `protobuf>=5.29.6,<7`.
- Regenerate `frames_pb2.py` with `grpcio-tools~=1.67.1` (protoc 5.x). Per
  Google's cross-version runtime guarantee, 5.x gencode runs on both 5.x
  and 6.x runtimes, so this single artifact serves all users.
- Loosen the dev pin `grpcio-tools` to `>=1.67.1,<2` so contributors can
  install `pipecat[dev,nvidia]` without resolver conflict. Comment in
  `frames.proto` documents the 1.67.x requirement for regeneration.
- Add an explicit `protobuf>=6.31.1,<7` to the `nvidia` extra. This
  compensates for nvidia-riva-client's missing `protobuf` install
  requirement (upstream packaging gap, see
  https://github.com/nvidia-riva/python-clients/issues/172). When that
  issue is resolved, the explicit protobuf entry in the `nvidia` extra
  can be removed.

Verified: pipecat imports cleanly on both protobuf 5.29.6 and 6.33.6;
`tests/test_protobuf_serializer.py` passes; `import riva.client` succeeds
when `pipecat[nvidia]` is installed.

2026-04-24 21:15:32 -04:00

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