Update woodpeckerci/plugin-docker-buildx Docker tag to v4

This PR contains the following updates:

Package	Update	Change
woodpeckerci/plugin-docker-buildx (source)	major	`3.2.1` -> `4.0.0`

Release Notes

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

### [`v4.0.0`](https://codeberg.org/woodpecker-plugins/docker-buildx/releases/tag/v4.0.0) [Compare Source](https://codeberg.org/woodpecker-plugins/docker-buildx/compare/v3.2.1...v4.0.0) - chore(deps): update docker docker tag to v26.1.0 - chore(deps): update docker/buildx-bin docker tag to v0.14.0 ([#155](https://togithub.com/woodpecker-plugins/docker-buildx/issues/155))

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woodpecker-ci / plugin-extend-env

Update woodpeckerci/plugin-docker-buildx Docker tag to v4 #42

Release Notes

Configuration