chore(deps): update docker.io/moby/buildkit:master-rootless docker digest to 6872e4e

This MR contains the following updates:

Package	Type	Update	Change
docker.io/moby/buildkit	final	digest	b2fe31d -> 6872e4e

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This MR has been generated by Renovate Bot.

added Category::maintenance Topic::dependencies labels

mentioned in issue #45

merged