Revert "Reland "Upgrade protobuf related packages to latest.""

Revert submission 3651866-proto-3.19.3

Reason for revert: Broke grpc-over-vsock
Reverted Changes:
I2c6939201:Reland "Upgrade dev-python/grpcio-tools to latest....
Id4d08822a:Reland "Upgrade protobuf related packages to lates...

Bug: b:233562362
Change-Id: I94c204bac6a2a4aca509c2cc5b3851d60f497003
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3659822
Commit-Queue: Daniel Verkamp <dverkamp@chromium.org>
Reviewed-by: David Munro <davidmunro@google.com>
Tested-by: Fergus Dall <sidereal@google.com>
20 files changed