chore(deps): update woodpeckerci/plugin-docker-buildx docker tag to v4 (#332)

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 | `3.2.1` -> `4.0.0` |

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### Release Notes

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

### [`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 ([#&#8203;155](https://github.com/woodpecker-plugins/docker-buildx/issues/155))

</details>

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Reviewed-on: https://codeberg.org/Codeberg/pages-server/pulls/332
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.woodpecker/build.yml

@@ -29,7 +29,7 @@ steps:
 
   docker-dryrun:
     depends_on: vendor
-    image: woodpeckerci/plugin-docker-buildx:3.2.1
+    image: woodpeckerci/plugin-docker-buildx:4.0.0
     settings:
       dockerfile: Dockerfile
       platforms: linux/amd64
@@ -99,7 +99,7 @@ steps:
 
   docker-next:
     depends_on: vendor
-    image: woodpeckerci/plugin-docker-buildx:3.2.1
+    image: woodpeckerci/plugin-docker-buildx:4.0.0
     settings:
       registry: codeberg.org
       dockerfile: Dockerfile
@@ -133,7 +133,7 @@ steps:
 
   docker-tag:
     depends_on: vendor
-    image: woodpeckerci/plugin-docker-buildx:3.2.1
+    image: woodpeckerci/plugin-docker-buildx:4.0.0
     settings:
       registry: codeberg.org
       dockerfile: Dockerfile