🤖 AI-generated PR — Please review carefully.

What

Add the project runtime dependencies (httpx==0.28.*, httpx-retries==0.5.*) to the mirrors-mypy hook's additional_dependencies in .pre-commit-config.yaml, mirroring the pins in pyproject.toml [project].dependencies.

Why

The mypy pre-commit hook runs in an isolated environment that previously installed only python-box. With httpx missing there, mypy strict = true + ignore_missing_imports = true made httpx.Auth collapse to Any, and disallow_subclassing_any failed locally on unchanged code:

mpt_api_client/auth/base.py:13: error: Class cannot subclass "Auth" (has type "Any")  [misc]

CI runs mypy with the full project dependencies (make check-all / uv run mypy .) and stayed green, so this only bit developers running pre-commit run locally. Aligning the hook's environment with the project's runtime deps removes the discrepancy.

Testing

• uv run pre-commit run mypy --all-files → passes
• Full pre-commit run --all-files, plus ruff format --check, ruff check, flake8, mypy, uv lock --check → green
• pytest tests/unit → 2310 passed, 99% coverage

Closes MPT-22538

• Added httpx==0.28.* and httpx-retries==0.5.* to the mirrors-mypy hook's additional_dependencies in .pre-commit-config.yaml to align the mypy pre-commit environment with project runtime dependencies
• Resolves false positive mypy errors triggered locally when running pre-commit run due to missing type information for httpx.Auth in the isolated pre-commit environment
• Eliminates the discrepancy between local and CI mypy environments, ensuring consistent type checking across workflows