chore(deps): update woodpeckerci/plugin-docker-buildx docker tag to v3 (#127)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [woodpeckerci/plugin-docker-buildx](https://codeberg.org/woodpecker-plugins/docker-buildx) ([source](https://codeberg.org/woodpecker-plugins/docker-buildx.git)) | major | `2.3.0` -> `3.0.0` |

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### Release Notes

<details>
<summary>woodpecker-plugins/docker-buildx (woodpeckerci/plugin-docker-buildx)</summary>

### [`v3.0.0`](https://codeberg.org/woodpecker-plugins/docker-buildx/releases/tag/v3.0.0)

[Compare Source](https://codeberg.org/woodpecker-plugins/docker-buildx/compare/v2.3.0...v3.0.0)

##### Breaking

-   Update to docker engine v25 ([release notes](https://docs.docker.com/engine/release-notes/25.0/))

##### Features

-   Add option to set individual mirrors for all logins ([#&#8203;122](https://github.com/woodpecker-plugins/docker-buildx/issues/122))
-   Add option to enable buildkit debug output ([#&#8203;119](https://github.com/woodpecker-plugins/docker-buildx/issues/119))

##### Dependencies

-   fix(deps): update module github.com/aws/aws-sdk-go to v1.49.21 ([#&#8203;125](https://github.com/woodpecker-plugins/docker-buildx/issues/125))
-   chore(deps): update docker/buildx-bin docker tag to v0.12.1 ([#&#8203;124](https://github.com/woodpecker-plugins/docker-buildx/issues/124))

</details>

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Reviewed-on: https://codeberg.org/woodpecker-plugins/docker-buildx/pulls/127
Reviewed-by: 6543 <6543@obermui.de>
Co-authored-by: woodpecker-bot <woodpecker-bot@obermui.de>
Co-committed-by: woodpecker-bot <woodpecker-bot@obermui.de>

.woodpecker.yml

@@ -7,7 +7,7 @@ when:
 
 variables:
   - &golang "golang:1.21"
-  - &build_plugin "woodpeckerci/plugin-docker-buildx:2.3.0"
+  - &build_plugin "woodpeckerci/plugin-docker-buildx:3.0.0"
   - base_settings: &base_buildx_settings
       platforms: "linux/amd64,linux/arm64"
       dockerfile: Dockerfile.multiarch