bump: Hugo to version 0.147.4 (#16499)

* bump: Hugo to version 0.147.2

* Add flag for hugo bump

* update comment

Co-authored-by: Craig Box <[email protected]>

* Update netlify.toml

---------

Co-authored-by: Craig Box <[email protected]>
Co-authored-by: Daniel Hawton <[email protected]>

Author: 3 people

netlify.toml

@@ -2,7 +2,11 @@
     publish = "public"
 
 [build.environment]
-    HUGO_VERSION = "0.145.0"
+    # Consult the Docs WG before bumping Hugo.
+    # 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"
     NODE_VERSION = "22.14.0"
     BUILD_WITH_CONTAINER = "0"
     GO_VERSION = "1.24.2"