Log Message:
protobuf py-protobuf: updated to [34].21.10

Protocol Buffers v21.10

Java

Use bit-field int values in buildPartial to skip work on unset groups of fields.
Mark nested builder as clean after clear is called

UPB

Fix UPB_LIKELY() for 32-bit Windows builds; update protobuf_deps to point to the \ 
current upb 21.x

Other

Add public modifiers to kotlin code