Fix: multi repo test to use memory

Author: tobymao

examples/multi/repo_1/config.yaml

@@ -1,4 +1,4 @@
-project: a
+project: repo_1
 
 connections:
     local:

tests/core/test_integration.py

@@ -633,7 +633,7 @@ def test_multi(mocker):
     assert len(plan.new_snapshots) == 4
     context.apply(plan)
 
-    context = Context(paths=["examples/multi/repo_1"])
+    context = Context(paths=["examples/multi/repo_1"], engine_adapter=context.engine_adapter)
     model = context.models["bronze.a"]
     model.query.select("'c' AS c", copy=False)
     plan = context.plan()