update test

Author: jonhealy1

stac_fastapi/tests/resources/test_item.py

@@ -829,6 +829,5 @@ async def test_search_datetime_validation_errors(app_client):
         resp = await app_client.post("/search", json=body)
         assert resp.status_code == 400
 
-        # Getting this instead ValueError: Invalid RFC3339 datetime.
-        # resp = await app_client.get("/search?datetime={}".format(dt))
-        # assert resp.status_code == 400
+        resp = await app_client.get("/search?datetime={}".format(dt))
+        assert resp.status_code == 400