fix: Use fastchain dependency in stream-metrics-index (#237)

The stream-metrics-index service should use
`deploy-network-subgraphs-fastchain` dependency instead of
`graph-deploy-streamregistry-subgraph` because we no longer support
non-`fastchain` images in `streamr-docker-dev`.

Author: teogeb

docker-compose.yml

@@ -478,7 +478,7 @@ services:
             - "4001:4001"
         depends_on:
             - mysql
-            - graph-deploy-streamregistry-subgraph
+            - deploy-network-subgraphs-fastchain
             - entry-point
     ens-sync-script:
         container_name: ens-sync-script