[istio] Add 1.28 (#8882)

See https://istio.io/latest/news/releases/1.28.x/.

Author: marcwrobel

products/istio.md

@@ -46,6 +46,13 @@ auto:
 # Effective and approximate EOL dates as well as Supported Kubernetes Versions can be found on
 # https://istio.io/latest/docs/releases/supported-releases/#support-status-of-istio-releases.
 releases:
+  - releaseCycle: "1.28"
+    releaseDate: 2025-11-05
+    eol: 2026-07-31
+    supportedKubernetesVersions: "1.30 - 1.34"
+    latest: "1.28.0"
+    latestReleaseDate: 2025-11-05
+
   - releaseCycle: "1.27"
     releaseDate: 2025-08-11
     eol: 2026-04-30