chore(deps): update renovate/renovate docker tag to v39.15.1

This MR contains the following updates:

Package	Type	Update	Change
renovate/renovate (source)	image	minor	39.13.1 -> 39.15.1

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Release Notes

renovatebot/renovate (renovate/renovate)

v39.15.1

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Build System

• deps: update dependency openpgp to v6 (#​32479) (d4b1502)

v39.15.0

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Features

• manager/cargo: support reading package version from workspace (local only) (#​32533) (6de1322)

Bug Fixes

• deps: update ghcr.io/renovatebot/base-image docker tag to v9.7.4 (#​32532) (7e6d11a)

v39.14.1

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Bug Fixes

• deps: update ghcr.io/renovatebot/base-image docker tag to v9.7.3 (#​32525) (89ebb35)

v39.14.0

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Features

• pep621: set Git insteadOf directives when updating pdm/uv locks (#​32378) (22880e9)

Miscellaneous Chores

• deps: update python:3.13 docker digest to a6ed02f (#​32524) (2862f76)

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