chore: updating python env to run (testing kokoro)

[iennae]

Description

Fixes #

Checklist

Testing

• I have tested this change on a live environment and verified it works as intended.

Compliance & Style

• I have followed the Sample Guidelines.
• The README is updated with all relevant information (if applicable).
• If this PR adds a new sample directory: I updated the CODEOWNERS file.

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Post-Approval Actions

• Please merge this PR for me once it is approved

[gemini-code-assist]

Code Review

This pull request updates the default test session in .trampolinerc from Python 3.7 (py-3.7) to Python 3.10 (py-3.10). There are no review comments, and I have no feedback to provide.