fix(deps): update rust crate substreams to 0.6

Author: renovate[bot]

examples/substreams-powered-subgraph/Cargo.toml

@@ -8,7 +8,7 @@ name = "substreams"
 crate-type = ["cdylib"]
 
 [dependencies]
-substreams = "0.5"
+substreams = "0.6"
 substreams-ethereum = "0.9"
 substreams-entity-change = "1.3"
 prost = "0.11"