Resolve pip-audit failure by upgrading LiteLLM

[Copilot]

The Vulnerable Dependency Check job was failing because pip-audit reported multiple advisories against the pinned litellm version and its resolved transitive dependencies. This change updates the Python dependency pin so the audit can resolve to patched packages without altering application code.

• Dependency remediation

  • Bump litellm from 1.83.7 to 1.84.0 in pyproject.toml
  • This clears the LiteLLM advisories flagged by CI and pulls in patched transitive dependencies such as aiohttp

• Scope

  • No workflow logic changes
  • No application code changes
  • Keeps the existing audit exceptions unchanged

dependencies = [
    "jsmin>=3.0.1",
    "csscompressor>=0.9.5",
    "pandas (>=2.3.2,<3.0.0)",
    "duckdb==1.4.3",
    "litellm==1.84.0",
]

[surajshetty3416]

Can't upgrade till BerriAI/litellm#30687 is merged and released