Add Renovate configuration for dependency management

[harryswift01]

Summary

This PR introduces Renovate, an automated dependency management tool that will help keep this repository up to date with the latest versions of dependencies, ensure compatibility with modern tech stacks, and reduce manual maintenance effort.

Changes

Add Renovate Configuration:

• Added a renovate.json file with a curated configuration based on Renovate’s best-practice presets.
• Enabled the pep621 manager to automatically update Python project metadata defined in pyproject.toml.
• Set rangeStrategy to replace to ensure version ranges are fully updated rather than only widened.
• Configured scheduling so Renovate only runs on weekdays at 8:00.
• Applied the dependencies label to all Renovate-generated PRs for easy filtering.
• Added package rules to:
  • Group monorepos and recommended sets of dependencies.
  • Prevent automerge for minor and patch updates, ensuring changes receive manual review.

Impact

• Ensures the repository's dependencies remain current and secure with minimal manual effort.
• Provides consistent, predictable update schedules to avoid unnecessary noise.
• Reduces the risk of technical debt accumulating over time.
• Improves dependency visibility through Renovate’s dependency dashboard.
• Allows controlled updates by disabling automerge for most update types, giving maintainers full oversight.