chore(deps): update docker.io/woodpeckerci/plugin-docker-buildx docker tag to v3 (#3229)

[![Mend
Renovate](https://app.renovatebot.com/images/banner.svg)](https://renovatebot.com)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
|
[docker.io/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` |

---

### Release Notes

<details>
<summary>woodpecker-plugins/docker-buildx
(docker.io/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://togithub.com/woodpecker-plugins/docker-buildx/issues/122))
- Add option to enable buildkit debug output
([#&#8203;119](https://togithub.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://togithub.com/woodpecker-plugins/docker-buildx/issues/125))
- chore(deps): update docker/buildx-bin docker tag to v0.12.1
([#&#8203;124](https://togithub.com/woodpecker-plugins/docker-buildx/issues/124))

</details>

---

### Configuration

📅 **Schedule**: Branch creation - "every weekend" (UTC), Automerge -
"before 4am" (UTC).

🚦 **Automerge**: Disabled by config. Please merge this manually once you
are satisfied.

♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
rebase/retry checkbox.

🔕 **Ignore**: Close this PR and you won't be reminded about this update
again.

---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/woodpecker-ci/woodpecker).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNy4xMzUuMCIsInVwZGF0ZWRJblZlciI6IjM3LjEzNS4wIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

.woodpecker/docker.yaml

@@ -15,7 +15,7 @@ variables:
   - &node_image 'docker.io/node:21-alpine'
   - &xgo_image 'docker.io/techknowlogick/xgo:go-1.21.5'
   - &xgo_version 'go-1.21.2'
-  - &buildx_plugin 'docker.io/woodpeckerci/plugin-docker-buildx:2.3.0'
+  - &buildx_plugin 'docker.io/woodpeckerci/plugin-docker-buildx:3.0.0'
   - &platforms_release 'linux/arm/v6,linux/arm/v7,linux/arm64/v8,linux/386,linux/amd64,linux/ppc64le,linux/riscv64,linux/s390x,freebsd/arm64,freebsd/amd64,openbsd/arm64,openbsd/amd64'
   - &platforms_server 'linux/arm/v7,linux/arm64/v8,linux/amd64,linux/ppc64le,linux/riscv64'
   - &platforms_preview 'linux/amd64'