Fix build

Author: imzyy

packages/firebase_dynamic_links/android/src/main/java/io/flutter/plugins/firebasedynamiclinks/FirebaseDynamicLinksPlugin.java

@@ -93,7 +93,7 @@ public void onMethodCall(MethodCall call, Result result) {
         buildShortDynamicLink(builder, call, createShortLinkListener(result));
         break;
       case "FirebaseDynamicLinks#getDynamicLink":
-        handleGetDynamicLink(result, Uri.parse(call.argument("url")));
+        handleGetDynamicLink(result, Uri.parse((String) call.argument("url")));
         break;
       case "FirebaseDynamicLinks#getInitialLink":
         handleGetInitialDynamicLink(result);