updating auth_window with correct type

Author: sam-gc

packages-exp/auth-exp/src/platform_browser/auth_window.ts

@@ -28,6 +28,7 @@ export type AuthWindow = {
 } & {
   // Any known / named properties we want to add
   grecaptcha?: Recaptcha;
+  ___jsl?: Record<string, any>;
 } & {
   // A final catch-all for callbacks (which will have random names) that
   // we will stick on the window.