tests(types): Update to represent a minimal change in the library

tests/types/expected.md

@@ -28,7 +28,7 @@ pub mod test {
             }
         }
         fn from_ptr(
-            ptr: Self::Ptr,
+            _ptr: Self::Ptr,
         ) -> Result<Self, trixy::types::error::TypeConversionError> {
             todo!()
         }