bump:Hugo to v0.147.8 (#16569)

Author: Ajay-singh1

netlify.toml

@@ -6,7 +6,7 @@
     # Specifically, the version here should match docker/build-tools/Dockerfile in istio/tools,
     # and the new build container should have been updated by Automator in istio/test-infra
     # before manually updating the version used by Netlify.
-    HUGO_VERSION = "0.147.4"
+    HUGO_VERSION = "0.147.8"
     NODE_VERSION = "22.14.0"
     BUILD_WITH_CONTAINER = "0"
     GO_VERSION = "1.24.2"