Fix test_multiple_decorators unit test for FastAPI 0.118.0

Fix the following error in test_galaxy_packages:

FAILED tests/webapps/api/test_cbv.py::test_multiple_decorators - AssertionError: fastapi_middleware_astack not found in request scope

xref. fastapi/fastapi#14128

Author: nsoranzo

test/unit/webapps/api/test_cbv.py

@@ -70,12 +70,14 @@ def get_item(self) -> int:  # Alphabetically before `get_test`
 
     app = FastAPI()
     app.include_router(router)
+    client = TestClient(app)
 
-    assert TestClient(app).get("/test").json() == 1
-    assert TestClient(app).get("/other").json() == 2
+    assert client.get("/test").json() == 1
+    assert client.get("/other").json() == 2
 
 
 def test_multiple_decorators() -> None:
+    app = FastAPI()
     router = APIRouter()
 
     @cbv(router)
@@ -90,7 +92,9 @@ def root(self, item_path: Optional[str] = None, item_query: Optional[str] = None
                 return {"item_query": item_query}
             return []
 
-    client = TestClient(router)
+    app = FastAPI()
+    app.include_router(router)
+    client = TestClient(app)
 
     assert client.get("/items").json() == []
     assert client.get("/items/1").json() == {"item_path": "1"}