openmldb_tool: pip install slow when install paramiko

https://github.com/4paradigm/OpenMLDB/blob/60debe319164d61a925660d6c9d5d25ad5f0ad11/python/openmldb_tool/setup.py#L34

`pip is looking at multiple versions of paramiko to determine which version is compatible with other requirements. This could take a while.`

So we should better to give a version of paramiko?

Look at the setup.py file in python/openmldb_tool/ to see the paramiko dependency. Check if a specific version is already pinned; if not, research compatible versions of paramiko with the project's other dependencies. Test the pip install after updating the version constraint to ensure it resolves quickly.

Vom Indexierungsmodell aus dem Issue-Text verfasst.