Update gspread_client.py

[sbagri]

Inside google, we are removing support for from gspread import gspread

Description of the change

remove support for from gspread import gspread

Motivation

When gspread is installed through pip, it can be used as import gspread

Type of change

Choose one: Bug fix

Checklist

• I have performed a self-review of my code.
• I have added detailed comments to my code where applicable.
• I have verified that my change does not break existing code.
• My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• I am familiar with the Google Style Guide for the language I have coded in.
• I have read through the Contributing Guide and signed the Contributor License Agreement.
  I am already a Googler so I don't need to sign the CLA as the CLA text says.

[google-cla]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

View this failed invocation of the CLA check for more information.

For the most up to date status, view the checks section at the bottom of the pull request.

[MarkDaoust]

Ah, I see what happened (cl/572251129).

Thanks for the fix, but we can't merge this until you sign the CLA.

[MarkDaoust]

@google-cla check again please [It's good now, I checked].