Add unexpected_cfgs for nu7 to Cargo.toml of zebra-consensus

Author: dmidem

zebra-consensus/Cargo.toml

@@ -103,3 +103,6 @@ tracing-subscriber = "0.3.18"
 zebra-state = { path = "../zebra-state", version = "1.0.0-beta.41", features = ["proptest-impl"] }
 zebra-chain = { path = "../zebra-chain", version = "1.0.0-beta.41", features = ["proptest-impl"] }
 zebra-test = { path = "../zebra-test/", version = "1.0.0-beta.41" }
+
+[lints.rust]
+unexpected_cfgs = { level = "warn", check-cfg = ['cfg(zcash_unstable, values("nu7"))'] }