Fix connection pool exhaustion in process_review_request

Increase database connection pool max_overflow from 2 to 5

Bump https://github.com/pre-commit/mirrors-mypy from v1.19.1 to 1.20.0 (#5917)

Bump https://github.com/astral-sh/ruff-pre-commit from v0.15.8 to 0.15.9 (#5915)

Bump types-python-dateutil from 2.9.0.20260323 to 2.9.0.20260402 (#5916)

Bump types-requests from 2.33.0.20260327 to 2.33.0.20260402 (#5918)

Bump aiohttp from 3.13.3 to 3.13.4 in /services/reviewhelper-api (#5909)

Use uv Docker image instead of installing uv in CI tasks

Use /services/* wildcard in dependabot config

Fix the import ordering for tomllib

Update all Dockerfiles to use uv instead of pip

Update dependabot config: replace pip with uv ecosystem

Update README and pre-commit config for uv migration

Update CI configuration and integration test to use uv

Convert http_service from setup.py to pyproject.toml with uv