Authorization Server should throw a GNAPServerRouteError if invalid token is used during rotation

[njlie]

The following conditional in the access token routes file does not throw a GNAPServerError like the rest of the errors in that route logic.

rafiki/packages/auth/src/accessToken/routes.ts

Lines 155 to 157 in be426fa

	if (!newToken) {
	throw new Error('invalid access token')
	}

It should throw a 404 http code and a invalid_rotation GNAP error code.