forwardRef and memo examples don't work with Typescript 5.1

Hello!

I tried to update our typescript to 5.1 and now we are seeing errors on our usage of `PolymorphicForwardRefExoticComponent`. The same error also happens with `PolymorphicMemoExoticComponent`

It also errors on playground using the example from the package: [TS Playground with Error](https://www.typescriptlang.org/play?#code/JYWwDg9gTgLgBAKjgQwM5wEoFNkGN4BmUEIcARFDvmQNwCwAUKJLHDAJ5hZwDejccAAoQANuxDQwAC2C4AYtADuyKABNsBAKIAPCDFkBhEpAB2WEzAA0-IaPGSZuQcTCoA6sBhSIAVxgbrBgFhMQkoaVlnCFcPLw1GAF84IhJySjwYAFpIUIdZTI4uVFpGAHpSuGZoeB44AAkcVWATAHMAESwCZB8RGE0RLBBzK3rG5paAeUUTKNc4JJTSMgA6UobkJtaShkZcCBNUeHXN9s7u3v7B4bgAXjgAcikAJnvGQu5j8amZl3Q7viCcD2ImgAH4AFxwQ5Qcb0BgJOGMLDaFjwd6jDbjWaoAA8NgAKnBkTBzKp0NgMstLkMLPjONw7u8IAQMScOl0en0BjSYIwAHy3Wy5cKObGxKQaHGfVrfbGWOD4vmIhjI1FA-aHVnjSEhewi2QKKDKNQaHR6QzGfbDPGA6WTaZymxMll29nnLlXCz8wUU-DLAhKFTqToACgIPhM+GA+y1rRtAkJxNJ5KoMCp3OGdK4gudsdOHIuGa9DD5IZsAIEAjQgUr6pBUBrlcO7AGjYEyw7lEO2JsCR1djCEScv3Fvn8nSlYxlDt+8sVjcoBEhvrThuNqiwwYIOOpwz5jAAlLwbHsDvBdxZl6n056YFmGSh0AAfJ95t2ci8wOECSgwHxQEw4B3It4EXG4eEXJJmwGcDamBaB5Q7ZZoO4BIkh4JCuxgbEklKJVEgPGggA)

Full Error is:

```ts
Type 'ForwardRefExoticComponent, "ref"> | Omit, HTMLObjectElement>, "ref"> | ... 121 more ... | Omit<...>, "as" | "color"> & HeadingOwnProps & { ...; } & RefAttributes<...>>' is not assignable to type 'PolymorphicForwardRefExoticComponent'.
Type 'ForwardRefExoticComponent, "ref"> | Omit, HTMLObjectElement>, "ref"> | ... 121 more ... | Omit<...>, "as" | "color"> & HeadingOwnProps & { ...; } & RefAttributes<...>>' is not assignable to type ' = "h2">(props: PolymorphicPropsWithRef) => ReactElement> | null'.
Type 'ReactNode' is not assignable to type 'ReactElement> | null'.
Type 'undefined' is not assignable to type 'ReactElement> | null'.
```

my lib versions are:
Typescript: 5.1.3
@types/react: 18.2.14
@types/react-dom: 18.2.6

Thank you

Start with the linked TypeScript Playground and the definitions or examples using PolymorphicForwardRefExoticComponent and PolymorphicMemoExoticComponent. Reproduce the errors with TypeScript 5.1.3, @types/react 18.2.14, and @types/react-dom 18.2.6, then identify why the examples no longer type-check. Done means both forwardRef and memo examples compile without the reported ReactNode error.

Written by the indexing model from the issue text.