[multiple repos] Upgrade fxamacker/cbor to v2.9.1 stream-mode branch

[fxamacker]

We should update to use the latest stream-mode branch of fxamacker/cbor.

• Sync feature/stream-mode to release v2.9.1 fxamacker/cbor#759
• Update Atree to use new version
• Update Cadence to use new version
• Update flow-go to use new version
• ... and test, etc. See prior task list for v2.8.0

Context

Ideally, we want to upgrade before external dependencies begin to upgrade their projects to fxamacker/cbor v2.9.1.