Update unexpected_cfgs syntax

Author: smoelius

Cargo.toml

@@ -13,12 +13,13 @@ members = [
 ]
 resolver = "2"
 
-[workspace.lints.rust]
-unexpected_cfgs = { level = "deny", check-cfg = [
+[workspace.lints.rust.unexpected_cfgs]
+level = "deny"
+check-cfg = [
     "cfg(dylint_lib, values(any()))",
     "cfg(fuzzing)",
     "cfg(serde_default)",
-] }
+]
 
 [workspace.lints.clippy]
 pedantic = { level = "warn", priority = -1 }