Enable additional Renovate package managers for this repo

Context

As part of the org-wide Renovate rollout for GitHub Actions
(announcement),
this repo got a Renovate config in #10 that is deliberately scoped to
GitHub Actions only:

// .github/renovate.json5
enabledManagers: ["github-actions"],

Every other built-in manager (npm, cargo, pip, docker, ...) was disabled during
rollout to avoid flooding repos with project-specific upgrade PRs that teams
didn't opt into.

What to do

The rollout is done — this repo's maintainers now own the Renovate config.
Please review which package managers
are relevant here and enable them, e.g.:

enabledManagers: ["github-actions", "npm"],

Then add packageRules to match how this repo wants updates batched/scheduled
(see the existing github-actions rule in the config as a reference).

If this repo previously used Dependabot for these ecosystems, prefer moving
them into Renovate so we keep one tool and one PR style — but that call is
yours.

Questions / DevOps support: ask in #devops or ping @glokos.

Start with .github/renovate.json5 and inspect the repository for manifests or configuration that identify relevant package managers. Review the existing GitHub Actions package rule and Renovate's manager documentation, then enable the appropriate managers and add packageRules for the repository's desired batching or scheduling. Done means the config covers the intended ecosystems without retaining unnecessary Dependabot coverage.