Update lab4.md with exam content

Author: Admin-01 SecW01

_labs/lab4.md

@@ -2,6 +2,11 @@
 
 With Dependency Review enabled and configured, we want to block vulnerable packages from entering the codebase. We can define a repository ruleset to enforce this as well!
 
+This lab covers parts of the following exam domains:
+
+Domain 3: Configure and use dependency management
+Domain 6: Describe GitHub Advanced Security best practices
+
 ## Exercise 1: Add the Dependency Review Action
 
 First, let's add the dependency review action workflow.