update defaults

defaults

@@ -11,5 +11,5 @@
     "database": "oss://pgx-reference-data/annovar_hg38/",
     "regions": "oss://pgx-reference-data/reference/wes_bedfiles/agilent_v6/SureSelect_Human_All_Exon_V6_r2.bed",
     "disk_size": "200",
-    "cluster_config": "OnDemand bcs.a2.3xlarge img-ubuntu-vpc"
+    "cluster_config": "OnDemand bcs.a2.7xlarge img-ubuntu-vpc"
 }