chore: use [lints] to address unexpected_cfgs lint (#7124)

tokio-stream/Cargo.toml

@@ -56,3 +56,6 @@ rustdoc-args = ["--cfg", "docsrs"]
 # This should allow `docsrs` to be read across projects, so that `tokio-stream`
 # can pick up stubbed types exported by `tokio`.
 rustc-args = ["--cfg", "docsrs"]
+
+[lints]
+workspace = true

tokio-stream/src/lib.rs

@@ -1,4 +1,3 @@
-#![allow(unknown_lints, unexpected_cfgs)]
 #![allow(
     clippy::cognitive_complexity,
     clippy::large_enum_variant,