chore(deps): update quay.io/thegeeklab/wp-docker-buildx docker tag to v4 (#40)

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

.woodpecker/build-container.yml

@@ -7,7 +7,7 @@ when:
 
 steps:
   - name: dryrun
-    image: quay.io/thegeeklab/wp-docker-buildx:3
+    image: quay.io/thegeeklab/wp-docker-buildx:4
     settings:
       containerfile: Containerfile.multiarch
       dry_run: true
@@ -20,7 +20,7 @@ steps:
       - event: [pull_request]
 
   - name: publish-dockerhub
-    image: quay.io/thegeeklab/wp-docker-buildx:3
+    image: quay.io/thegeeklab/wp-docker-buildx:4
     group: container
     settings:
       auto_tag: true
@@ -41,7 +41,7 @@ steps:
           - ${CI_REPO_DEFAULT_BRANCH}
 
   - name: publish-quay
-    image: quay.io/thegeeklab/wp-docker-buildx:3
+    image: quay.io/thegeeklab/wp-docker-buildx:4
     group: container
     settings:
       auto_tag: true