fix import statements for legacy client

[junefish]

Problem

running from pinecone import Pinecone gives the error `ImportError: cannot import name 'Pinecone' from 'pinecone'

Solution

Updated import statement to reflect legacy client (2.2.4)

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• Infrastructure change (CI configs, etc)
• Non-code change (docs, etc)
• None of the above: (explain here)

Test Plan

Tested in Colab

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