react-router: Compat with React 19 types

[eps1lon]

Closes eps1lon/DefinitelyTyped#21

Changes

Only one non-codemoddable change that is related to ReactElement<unknown>

[eps1lon]

All green on yarn tsc -b tsconfig.json except

packages/react-router-dom-v5-compat/index.ts:185:8 - error TS2307: Cannot find module './react-router-dom' or its corresponding type declarations.

185 } from "./react-router-dom";
           ~~~~~~~~~~~~~~~~~~~~

which seems unrelated.