Fix test_reauth: use sls_tempfile as context manager so the SLS file is actually written

Agent-Logs-Url: https://github.com/saltstack/salt/sessions/924c9724-9060-401b-8bea-b556ed53854e

Co-authored-by: dwoz <1527763+dwoz@users.noreply.github.com>

Author: Copilot

tests/pytests/integration/minion/test_reauth.py

@@ -45,7 +45,7 @@ def handler(data):
     )
     cli = master.salt_cli()
     start_time = time.time()
-    with master.started(), minion.started():
+    with master.started(), minion.started(), sls_tempfile:
         events = event_listener.get_events(
             [(master.id, "salt/auth")],
             after_time=start_time,