test(sp7): update migration version assertion to 6 (SP7 + TA1 WIP)

backend/tests/test_acks.py

@@ -56,12 +56,12 @@ def test_migration_latest_idempotent_on_fresh_db():
     ta1_acks table (this PR)."""
     with db.engine().begin() as c:
         v1 = c.exec_driver_sql("PRAGMA user_version").scalar() or 0
-    assert v1 == 5
+    assert v1 == 6
     # A second run should not raise and should not bump the version.
     db_migrate.run(db.engine())
     with db.engine().begin() as c:
         v2 = c.exec_driver_sql("PRAGMA user_version").scalar() or 0
-    assert v2 == 5
+    assert v2 == 6
 
 
 def test_add_ack_persists_row():