chore: update anvil explorer catalog to anvil6 (#4030) (#4031)

Author: NoopDog

explorer/site-config/anvil-cmg/prod/config.ts

@@ -9,7 +9,7 @@ const config: SiteConfig = {
     "https://explore.anvilproject.org",
     "https://anvilproject.org",
     "https://service.explore.anvilproject.org",
-    "anvil5"
+    "anvil6"
   ),
   exportToTerraUrl: "https://anvil.terra.bio/",
 };