Alkwa/update express (#5577)

* updating express to 4.21.2 so we can fix a dependnecy issue with path-to-regexp

* Change files

Author: alkwa-msft

change-beta/@azure-communication-react-7883216f-9767-4ce0-bacd-75bfc92e8b80.json

@@ -0,0 +1,9 @@
+{
+  "type": "prerelease",
+  "area": "improvement",
+  "workstream": "Updating test server dependencies",
+  "comment": "updating express to 4.21.2 so we can fix a dependnecy issue with path-to-regexp",
+  "packageName": "@azure/communication-react",
+  "email": "[email protected]",
+  "dependentChangeType": "patch"
+}