- Why I did it
Upgrading the reference for the Python GNMI tool repository. The commit for the new payload

- How I did it
Commit reference updated in the PTF docker file where that tool is needed.

- How to verify it
PyTest suite for telemetry service should pass.

- Which release branch to backport (provide reason below if selected)
NA

• 201811
• 201911
• 202006

- Description for the changelog
Upgrading the reference for the Python GNMI tool repository to latest commit.

- A picture of a cute animal (not mandatory but encouraged)

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