chore(deps): update quay.io/thegeeklab/wp-docker-buildx docker tag to v6 (#25)

Reviewed-on: #25
Co-authored-by: Renovator Bot <renovator@rknet.org>
Co-committed-by: Renovator Bot <renovator@rknet.org>

.woodpecker/build-container.yml

@@ -7,7 +7,7 @@ when:
 
 steps:
   - name: security-build
-    image: quay.io/thegeeklab/wp-docker-buildx:5
+    image: quay.io/thegeeklab/wp-docker-buildx:6
     settings:
       containerfile: Containerfile.multiarch
       output: type=oci,dest=oci/${CI_REPO_NAME},tar=false
@@ -30,7 +30,7 @@ steps:
       TRIVY_DB_REPOSITORY: docker.io/aquasec/trivy-db:2
 
   - name: publish-dockerhub
-    image: quay.io/thegeeklab/wp-docker-buildx:5
+    image: quay.io/thegeeklab/wp-docker-buildx:6
     depends_on: security-scan
     settings:
       auto_tag: true
@@ -51,7 +51,7 @@ steps:
           - ${CI_REPO_DEFAULT_BRANCH}
 
   - name: publish-quay
-    image: quay.io/thegeeklab/wp-docker-buildx:5
+    image: quay.io/thegeeklab/wp-docker-buildx:6
     depends_on: security-scan
     settings:
       auto_tag: true