chore(librarian): update synthtool SHA

[parthea]

The source of truth for the "generated" README for client libraries currently lives at https://github.com/googleapis/synthtool/blob/master/synthtool/gcp/templates/python_mono_repo_library/README.rst

We recently dropped Python 3.7 and 3.8 in #16150 and #16102.

The supported Python runtimes was recently updated to reflect this change in googleapis/synthtool#2168 (commit googleapis/synthtool@96f416c).

We need to update the synthtool commit in the python librarian Dockerfile to include the new README.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request updates the synthtool version pinned within the librarian Dockerfile. The primary goal is to propagate recent changes from the synthtool repository, specifically those related to Python runtime support, into the client library generation process. This ensures that documentation, such as README files, accurately reflects the currently supported Python versions after the deprecation of Python 3.7 and 3.8.

Highlights

• Synthtool Version Update: The synthtool commit SHA in the librarian Dockerfile has been updated to 96f416c959fbe8048200b6c16000de32b352902e.
• Python Runtime Reflection: This update ensures that the generated README files for client libraries correctly reflect the recent deprecation of Python 3.7 and 3.8 runtimes.

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[gemini-code-assist]

Code Review

This pull request updates the synthtool git commit hash in the .generator/Dockerfile. The reviewer suggests adding a comment to explain the reason for checking out this specific commit to improve maintainability and provide context for future updates.

[gemini-code-assist]

To improve maintainability, consider adding a comment to explain why this specific commit is being checked out. This provides valuable context for future updates.

    git checkout 96f416c959fbe8048200b6c16000de32b352902e # Update supported Python versions in README template