build: add renovate bot

[Ian2012]

Description

This PR implements the renovate bot to update helm Chart dependencies.

It was run with a temporal Personal Access Token on a fork. See https://github.com/eduNEXT/openedx-k8s-harmony/pulls for details of the PRs. Here is the log of a successful run: https://github.com/eduNEXT/openedx-k8s-harmony/actions/runs/11521490246/job/32075754011

The upgrades will be easily tested once #80 is merged

frontend-app-authoring already uses renovate to upgrade npm packages.

[openedx-webhooks]

Thanks for the pull request, @Ian2012!

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