fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by adding pyopenssl dependency in pyproject.toml

[agrawalradhika-cell]

fix: Resolving MutualTLSChannelError 'OpenSSL' module error on by adding pyopenssl dependency in pyproject.toml

• Add 'pyopenssl' to project dependencies to fix MutualTLSChannelError encountered during mTLS channel configuration.

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Link to Issue or Description of Change

1. Link to an existing issue (if applicable):

• Closes: (https://b.corp.google.com/issues/476896873)
• Related: #issue_number

2. Or, if no issue exists, describe the change:

If applicable, please follow the issue templates to provide as much detail as
possible.

Problem:
The ADK (Agent Development Kit) fails with a MutualTLSChannelError because the google-auth library cannot find the OpenSSL module during mTLS channel configuration.

Solution:
Dependency Hardening for (pyopenssl)

Testing Plan

Tested on colab with a test-branch fix and see that the module error doesn't persist after the fix. See colab for more details

Unit Tests:

• I have added or updated unit tests for my change.
• [] All unit tests pass locally.

Please include a summary of passed pytest results.

Manual End-to-End (E2E) Tests:

1. Create Custom AdkApp which overrides async_create_session to refresh credentials and call a GCS bucket-listing helper during session initialization.
2. LlmAgent is initialized and deployed to Vertex AI as a Reasoning Engine with AGENT_IDENTITY enabled and specific
3. Configure IAM Permissions to grant the Agent Identity mandatory IAM roles
4. the async_create_session method is called on the remote application to verify that the agent is successfully able to use GCS.

Checklist

• I have read the CONTRIBUTING.md document.
• I have performed a self-review of my own code.
• [] I have commented my code, particularly in hard-to-understand areas.
• I have added tests that prove my fix is effective or that my feature works.
• New and existing unit tests pass locally with my changes.
• I have manually tested my changes end-to-end.
• [] Any dependent changes have been merged and published in downstream modules.

Additional context

Add any other context or screenshots about the feature request here.

[gemini-code-assist]

Summary of Changes

Hello @agrawalradhika-cell, 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 resolves a critical MutualTLSChannelError that occurred during mTLS channel configuration within the ADK (Agent Development Kit). The issue stemmed from a missing pyopenssl dependency, which is implicitly required by the google-auth library. By explicitly adding pyopenssl to the project's dependencies, the necessary OpenSSL module is now guaranteed to be available, preventing application failures and ensuring secure communication.

Highlights

• Dependency Management: Added pyopenssl with version >=25.3.0 to the project dependencies in pyproject.toml. This addition is crucial for resolving MutualTLSChannelError encountered during mTLS channel configuration.

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[gemini-code-assist]

Code Review

This pull request correctly resolves a MutualTLSChannelError by adding pyopenssl as a dependency. My review includes a suggestion to add a version upper bound and a descriptive comment for this new dependency to improve maintainability and align with the existing format of other dependencies in pyproject.toml.