Upgrade google-adk from 1.18.0 to 1.28.1.

[nick-nlb]

Description

The pinned version of google-adk had a security vulnerability. This PR upgrades that library, along with other libraries that needed to be upgrade as part of the dependency cascade.

Notes

This resulted in a number of dependency upgrades (visible in the updated pyproject.toml file. I upgraded the minimal number of libraries possible to allow us to update google-adk.

One of the updates setuptools being dropped as the dependency tree. This is explicitly restored at a version that allows us to run our test suites.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a security vulnerability by upgrading the google-adk library. To support this change, a series of cascading dependency updates were performed to ensure system compatibility and stability. Additionally, specific constraints were applied to the test environment to maintain consistent test execution.

Highlights

• Security Patch: Upgraded google-adk from 1.18.0 to 1.28.1 to address a security vulnerability.
• Dependency Cascade: Updated several related libraries, including fastapi, google-auth, google-cloud-aiplatform, google-genai, pydantic, and typing-extensions, to maintain compatibility.
• Environment Configuration: Explicitly added setuptools < 67.0.0 to the test dependencies to ensure test suite stability.

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[gemini-code-assist]

Code Review

This pull request updates several core dependencies in server/pyproject.toml, including fastapi, google-adk, google-auth, google-cloud-aiplatform, google-genai, pydantic, and typing-extensions, and adds a version constraint for setuptools in the test suite. The reviewer recommends updating server/requirements.txt to match these changes and adding documentation to explain the setuptools version pin.