ci: replace deprecated workflow syntax

.woodpecker/test.yaml

@@ -6,9 +6,9 @@ when:
       - ${CI_REPO_DEFAULT_BRANCH}
 
 variables:
+  - &molecule_image quay.io/thegeeklab/ansible-dev-tools:1
   - &molecule_base
-    image: quay.io/thegeeklab/ansible-dev-tools:1
-    group: molecule
+    depends_on: []
     environment:
       PY_COLORS: "1"
       HCLOUD_TOKEN:
@@ -16,6 +16,7 @@ variables:
 
 steps:
   - name: molecule-default
+    image: *molecule_image
     <<: *molecule_base
     commands:
       - molecule test -s default