Fix to install the python sdk with pandas for python version >= 3.7

[nikhilhegde-ddw]

Ticket : https://dataworld.atlassian.net/browse/PAP-36

• Removed support for python version <=3.6
• Reason for removing support for python version <=3.6 are
  • Support and security fixes for python version <=3.6 has ended.
  • Selected pandas and numpy module version which are compatible with python version>=3.7. Pandas and numpy module which are compatible with python version = 3.6 are not compatible with python version 3.9+