Bump Istio to 1.14.3

- [Istio 1.14.3 patch
release](https://istio.io/latest/news/releases/1.14.x/announcing-1.14.3/)
- Vendir sync

Co-authored-by: Julian Hjortshoj <hjortshojj@vmware.com>

Author: Birdrock

build/istio/values.yaml

@@ -5,7 +5,7 @@
 #! These values cannot be changed later when rendering cf-for-k8s templates.
 #! Values related to CF should NOT be in this file.
 
-istio_version: 1.14.2
+istio_version: 1.14.3
 
 fluentbit:
   image: cloudfoundry/cf-k8s-networking-fluentbit@sha256:64d67dc076d4160c351272261d7730c08c1b906a881d1812778b6da93871d4e4