fix(grpc-server): fix host in sample env

Author: TanmayArya-1p

crates/grpc_server/.sample.env

@@ -1,7 +1,7 @@
 GRPC_SERVER_ROOT_PASSWORD=123 # required
 GRPC_SERVER_DIMENSION=3 # required
 
-GRPC_SERVER_HOST=localhost # defaults to 127.0.0.1 aka localhost
+GRPC_SERVER_HOST=127.0.0.1 # defaults to 127.0.0.1 aka localhost
 GRPC_SERVER_PORT=8080 # defaults to 8080
 GRPC_SERVER_STORAGE_TYPE=inmemory # (inmemory/rocksdb) defaults to 'inmemory'
 GRPC_SERVER_INDEX_TYPE=flat # defaults to flat