bump vara spkg import for the minimal codegen to 0.1.6 which supports…

… the latest changes to vara decoding of extrinsics and events

vara-minimal/templates/substreams.yaml.gotmpl

@@ -30,7 +30,7 @@ modules:
 
 # For performance, you should use a blockFilter whenever possible, like this:
 # imports:
-#   vara: https://spkg.io/streamingfast/vara-common-v0.1.5.spkg
+#   vara: https://spkg.io/streamingfast/vara-common-v0.1.6.spkg
 #
 # modules:
 #   - name: (...)