Update src/content/docs/identityserver/upgrades/identityserver4-to-duende-identityserver-v7.mdx

Author: maartenba

src/content/docs/identityserver/upgrades/identityserver4-to-duende-identityserver-v7.mdx

@@ -2,7 +2,7 @@
 title: "IdentityServer4 to Duende IdentityServer v7.3"
 sidebar:
   order: 138
-  label: IdentityServer4 → v7.2
+  label: IdentityServer4 → v7.3
 ---
 
 import { Code } from "astro/components";