If you are using out-of-the-box VertiGIS Studio Web, no action is required. As part of our ongoing work to insulate you from Esri technology change over time, we’ve updated VertiGIS Studio Web and you won’t notice the change.
Anything previously referenced via tasks is now referenced via rest. In Esri’s words:
“Tasks have been deprecated since 4.20. They were removed at 4.24. The replacements are the classes and modules in the esri/rest folder. This will make it easier to incorporate your code into a more modular app design, and also reduce unnecessary dependencies (you only import what you want). The new rest modules are functions, which do not require constructors, so you can use their methods immediately.”
You can change and test your code today to use Esri’s new esri/rest pattern, there is no need to wait for VertiGIS Studio Web 5.21 (in fact, you are in better shape if you don’t wait!)