[Enhancement] fix `python3 -m pip install kclvm` command error message.

[Peefy]

Enhancement

On ubuntu:20.04, execute the following command, it shows the error message:

ERROR: pygls 0.10.3 has requirement pydantic<1.9,>=1.7, but you'll have pydantic 1.10.4 which is incompatible.

But on ubuntu:latest, this error message does not appear.