[red-knot] Make BoundMethodType a salsa interned (#17581)

crates/red_knot_python_semantic/src/types.rs

@@ -6223,7 +6223,7 @@ impl KnownFunction {
 /// on an instance of a class. For example, the expression `Path("a.txt").touch` creates
 /// a bound method object that represents the `Path.touch` method which is bound to the
 /// instance `Path("a.txt")`.
-#[salsa::tracked(debug)]
+#[salsa::interned(debug)]
 pub struct BoundMethodType<'db> {
     /// The function that is being bound. Corresponds to the `__func__` attribute on a
     /// bound method object