update istio/istio submodule to catch lds performance bottleneck

dinoallo · dinoallo · commit 21a7a2cd9f3f · 2025-06-20T15:23:37.000+08:00
diff --git a/istio/istio b/istio/istio
@@ -1 +1 @@
-Subproject commit 00f92c2a080485d961152bea612fc2ada4341d7c
+Subproject commit cd68e70100f5b4faeb3bca0da3643e0300b1533b
