Avoid jinja[invalid] with vars on task (#2588)

Fixes: #2569

Author: ssbarnea

examples/playbooks/rule-jinja-valid.yml

@@ -20,3 +20,9 @@
         owner: "root"
         group: "dovecot"
         mode: "0640"
+    - name: Bug https://github.com/ansible/ansible-lint/issues/2569
+      ansible.builtin.include_tasks:
+        file: /dev/null
+      vars:
+        ns_vars: {}
+        x: "{{ lookup('ansible.builtin.template', 'namespace.yaml.j2', template_vars=ns_vars) | from_yaml }}"

src/ansiblelint/rules/jinja.py

@@ -62,7 +62,7 @@ def matchtask(  # noqa: C901
                     template(
                         basedir=file.dir if file else ".",
                         value=v,
-                        variables={},
+                        variables=task.get("vars", {}),
                         fail_on_error=True,  # we later decide which ones to ignore or not
                     )
                 # ValueError RepresenterError