[deps] Update dependencies for vulnerabilities

[gregnazario]

Description

Updates dependencies in the Python SDK

Test Plan

Related Links

[Copilot]

Pull Request Overview

Updates Python SDK dependencies to address security vulnerabilities by upgrading existing packages and adding new dependency constraints.

• Updates existing dependencies (typing-extensions, types-six, multidict) to newer versions
• Adds explicit version constraints for security-related packages (h2, urllib3, requests, aiohttp)
• Documents the changes in the changelog

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updates dependency versions and adds new security-focused constraints
CHANGELOG.md	Documents the dependency updates for vulnerability fixes

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