even LESS concurrency for cambium

src/pudl_archiver/archivers/nrelcambium.py

@@ -28,7 +28,7 @@ class NrelCambiumArchiver(AbstractDatasetArchiver):
     """NREL Cambium archiver."""
 
     name = "nrelcambium"
-    concurrency_limit = 2  # Cambium scenarios are Large so only handle 2 at a time
+    concurrency_limit = 1  # Cambium scenarios are Large so only handle 2 at a time
 
     async def get_resources(self) -> ArchiveAwaitable:
         """Download NREL Cambium resources."""