Move needless_type_cast lint to nursery

The lint is new and already has several bugs filed against it, including
an ICE.

clippy_lints/src/casts/mod.rs

@@ -836,7 +836,7 @@
     /// ```
     #[clippy::version = "1.93.0"]
     pub NEEDLESS_TYPE_CAST,
-    pedantic,
+    nursery,
     "binding defined with one type but always cast to another"
 }