Bhaskar,
As Vinod pointed out, yes, Python 2 support was dropped in 2020. However, all previous releases supporting Python 2 should theoretically continue working. Try pinning to grpcio==1.39.0.
Realistically speaking though, you should really consider moving off of Python 2. No bug or security fixes are being backported to this version, so you put yourself at more and more risk over time by sticking with Python 2.