chore(deps): update dependency renovate to v39.15.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
renovate (source)	39.15.3 -> 39.15.4

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Release Notes

renovatebot/renovate (renovate)

### [`v39.15.4`](https://redirect.github.com/renovatebot/renovate/releases/tag/39.15.4) [Compare Source](https://redirect.github.com/renovatebot/renovate/compare/39.15.3...39.15.4) ##### Bug Fixes - **deps:** update ghcr.io/renovatebot/base-image docker tag to v9.7.6 ([#​32557](https://redirect.github.com/renovatebot/renovate/issues/32557)) ([a79fd60](https://redirect.github.com/renovatebot/renovate/commit/a79fd606ebbce416d84a897d61d00281cdb38258)) ##### Miscellaneous Chores - **deps:** update python:3.13 docker digest to [`bc78d3c`](https://redirect.github.com/renovatebot/renovate/commit/bc78d3c) ([#​32553](https://redirect.github.com/renovatebot/renovate/issues/32553)) ([af7d6c6](https://redirect.github.com/renovatebot/renovate/commit/af7d6c68356fd71ac622cb41b2ca04dc2f4ea09e)) - **deps:** update slackapi/slack-github-action action to v1.27.1 ([#​32554](https://redirect.github.com/renovatebot/renovate/issues/32554)) ([7877afc](https://redirect.github.com/renovatebot/renovate/commit/7877afc2050007fbd60547f9673d2e59519e0a48))

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