express-serve-static-core change makes problems with RegEx in route parameters

[Nightloewe]

This commit changed the value of req.params from ParamsDictionary to RouteParameters<T> which now causes errors when trying to use an url like /:id([0-9]+) to validate the route parameter. The error is:
Property 'id' does not exist on type 'RouteParameters<"/:id([0-9]+)">'. ts(2339)

Normally you should be able to use regular expressions for route parameters and then access them by req.params.id, but TypeScript shows this as an error.