Updated the PnP JS Core link (SharePoint#1557)

Updated the PnP JS Core hyperlink to the new repository.

Author: estruyf

docs/spfx/web-parts/guidance/connect-to-sharepoint-using-jsom.md

@@ -607,7 +607,7 @@ While using the `SPComponentLoader` requires some additional effort, it allows y
 
 ## Considerations
 
-In the past, when building client-side customizations on SharePoint, you might have used SharePoint JSOM to communicate with SharePoint. However, the recommended approach is to use the SharePoint REST API either directly or through the [PnP JavaScript Core Library](https://github.com/SharePoint/PnP-JS-Core).
+In the past, when building client-side customizations on SharePoint, you might have used SharePoint JSOM to communicate with SharePoint. However, the recommended approach is to use the SharePoint REST API either directly or through the [PnP JavaScript Core Library](https://github.com/pnp/pnpjs).
 
 When SharePoint JSOM was introduced, it was the first step towards supporting client-side solutions on SharePoint. However, it is no longer being actively maintained and might not offer access to all capabilities available through the REST API. Additionally, whether using the SharePoint REST API directly or through the PnP JavaScript Core Library, you can use promises which significantly simplify writing asynchronous code (a common problem when utilizing JSOM).