Chore: Update ghcr.io/renovatebot/renovate Docker tag to v39.12.0

[grafanarenovatebot[bot]]

This PR contains the following updates:

Package	Update	Change
ghcr.io/renovatebot/renovate (source)	minor	39.11.7 -> 39.12.0

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Release Notes

renovatebot/renovate (ghcr.io/renovatebot/renovate)

### [`v39.12.0`](https://redirect.github.com/renovatebot/renovate/releases/tag/39.12.0) [Compare Source](https://redirect.github.com/renovatebot/renovate/compare/39.11.7...39.12.0) ##### Features - **config:** Log unknown parsing error at debug level ([#​32512](https://redirect.github.com/renovatebot/renovate/issues/32512)) ([de518af](https://redirect.github.com/renovatebot/renovate/commit/de518af333879e5a2e131a9f73513d0b467a855c)) ##### Documentation - **faq:** update Renovate version in example ([#​32503](https://redirect.github.com/renovatebot/renovate/issues/32503)) ([b6acbff](https://redirect.github.com/renovatebot/renovate/commit/b6acbff28fd72a1cae2358bdc478aa7aed5aff3e)) - **gitlab:** Fix link to gitlab codeowners documentation ([#​32508](https://redirect.github.com/renovatebot/renovate/issues/32508)) ([40a6004](https://redirect.github.com/renovatebot/renovate/commit/40a600488c455aeec7132ce73635daa01c4d098c)) ##### Miscellaneous Chores - **deps:** update dependency [@​swc/core](https://redirect.github.com/swc/core) to v1.9.1 ([#​32507](https://redirect.github.com/renovatebot/renovate/issues/32507)) ([3de0340](https://redirect.github.com/renovatebot/renovate/commit/3de0340fdc60090063bd51776ad4e31289016df9)) - **deps:** update python:3.13 docker digest to [`7cbaafd`](https://redirect.github.com/renovatebot/renovate/commit/7cbaafd) ([#​32498](https://redirect.github.com/renovatebot/renovate/issues/32498)) ([202b549](https://redirect.github.com/renovatebot/renovate/commit/202b5492622958e60e0c7ce99398deee881f017f)) - **deps:** update python:3.13 docker digest to [`e1b0f7d`](https://redirect.github.com/renovatebot/renovate/commit/e1b0f7d) ([#​32515](https://redirect.github.com/renovatebot/renovate/issues/32515)) ([e4ae874](https://redirect.github.com/renovatebot/renovate/commit/e4ae87402797d85a6042dca1670a8aabce2c5acc))

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Configuration

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This PR has been generated by Renovate Bot.