Remove contributors with deleted accounts (DefinitelyTyped#72161)

Co-authored-by: TypeScript Bot <[email protected]>
Co-authored-by: Isabel Duan <[email protected]>
Co-authored-by: Jolyn Denning <[email protected]>

Author: 4 people

types/systemjs/package.json

@@ -8,5 +8,10 @@
     "devDependencies": {
         "@types/systemjs": "workspace:."
     },
-    "owners": []
+    "owners": [
+        {
+            "name": "Jolyn Denning",
+            "githubUsername": "jolyndenning"
+        }
+    ]
 }