Update docker.io/woodpeckerci/plugin-docker-buildx Docker tag to v3.2.0

[renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/woodpeckerci/plugin-docker-buildx (source)	minor	3.1.0 -> 3.2.0

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Release Notes

woodpecker-plugins/docker-buildx (docker.io/woodpeckerci/plugin-docker-buildx)

v3.2.0

Compare Source

Features

• Allow default_tag to be empty (#​145) WARNING: not battle-tested (as I did not have a use case and testing repo). Please expect issues along the way.
• Add SOURCE_DATE_EPOCH build_arg (#​130)
• Add provenance config setting (#​139)
• Add secrets config setting (#​135)

Dependencies

• chore(deps): update docker/buildx-bin docker tag to v0.13.1
• chore(deps): update docker docker tag to v25.0.4

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