Fix broken link to Prefect website in deploy guide (#2885)

docs/source/deployment/prefect.md

@@ -1,6 +1,6 @@
 # Prefect
 
-This page explains how to run your Kedro pipeline using [Prefect 2.0](https://www.prefect.io/products/core/), an open-source workflow management system.
+This page explains how to run your Kedro pipeline using [Prefect 2.0](https://www.prefect.io/opensource), an open-source workflow management system.
 
 The scope of this documentation is the deployment to a self hosted [Prefect Server](https://docs.prefect.io/2.10.17/host/), which is an open-source backend that makes it easy to monitor and execute your Prefect flows and automatically extends Prefect 2.0. We will use an [Agent that dequeues submitted flow runs from a Work Queue](https://docs.prefect.io/2.10.17/tutorial/deployments/#why-workpools-and-workers).