refactor: package changes

[Kingshuk-Microsoft]

Purpose

This pull request updates dependency versions in both the src/backend/pyproject.toml and src/mcp_server/pyproject.toml files to use exact versions rather than version ranges. This helps ensure consistent and reproducible builds by locking dependencies to specific versions.

Dependency version pinning:

• Updated all dependencies in src/backend/pyproject.toml to use exact versions instead of version ranges, including major libraries like azure-ai-evaluation, azure-cosmos, fastapi, openai, and opentelemetry packages.
• Changed the python-dotenv dependency in both src/backend/pyproject.toml and src/mcp_server/pyproject.toml to use the exact version 1.1.1 instead of a minimum version requirement. [1] [2]

Does this introduce a breaking change?

• Yes
• No

Other Information

This change ensure stable dependency versions across builds