Fix linting errors.

tests/integration/targets/docker_stack/vars/main.yml

@@ -4,17 +4,17 @@
 # SPDX-License-Identifier: GPL-3.0-or-later
 
 stack_compose_base:
-    version: '3'
-    services:
-        busybox:
-            image: "{{ docker_test_image_busybox }}"
-            command: sleep 3600
+  version: '3'
+  services:
+    busybox:
+      image: "{{ docker_test_image_busybox }}"
+      command: sleep 3600
 
 stack_compose_overrides:
-    version: '3'
-    services:
-        busybox:
-            environment:
-                envvar: value
+  version: '3'
+  services:
+    busybox:
+      environment:
+        envvar: value
 
 stack_update_expected_diff: '{"test_stack_busybox": {"TaskTemplate": {"ContainerSpec": {"Env": ["envvar=value"]}}}}'