chore: add changelog for release v1.11.3

Author: b4s36t4

changelog/enterprise.mdx

@@ -1,12 +1,24 @@
 ---
 title: "Enterprise Gateway"
-sidebarTitle: "Enterprise Gateway [1.11.2]"
+sidebarTitle: "Enterprise Gateway [1.11.3]"
 ---
 
 <Card title="Schedule Call" href="https://portkey.sh/demo-21" icon="calendar" horizontal>
 Discuss how Portkey's AI Gateway can enhance your organization's AI infrastructure
 </Card>
 
+<Update label="1.11.3" description="2025-06-06">
+## v1.11.3
+---
+
+### Fixes And Improvements
+- Prometheus Metrics use endpoint instead of path for all the metrics.
+- Add a global error handler for all the unhandled exceptions.
+- JWT Plugin to check for `iat` and validate.
+
+
+</Update>
+
 <Update label="1.11.2" description="2025-06-03">
 ## v1.11.2
 ---