bump dependencies (#906)

Author: dprotaso

docs/test-version.md

@@ -15,6 +15,6 @@ The following Gateway API version and Ingress were tested as part of the release
 
 | Ingress | Tested version          | Unavailable features           |
 | ------- | ----------------------- | ------------------------------ |
-| Istio   | v1.27.1     | retry,httpoption   |
+| Istio   | v1.28.0     | retry,httpoption   |
 | Contour | v1.33.0    | httpoption |
-| Envoy Gateway | v1.5.1    | httpoption,host-rewrite |
+| Envoy Gateway | v1.6.0    | httpoption,host-rewrite |

hack/test-env.sh

@@ -15,10 +15,10 @@
 # limitations under the License.
 
 export GATEWAY_API_VERSION="v1.4.0"
-export ISTIO_VERSION="1.27.1"
+export ISTIO_VERSION="1.28.0"
 export ISTIO_UNSUPPORTED_E2E_TESTS="retry,httpoption"
 export CONTOUR_VERSION="v1.33.0"
 export CONTOUR_UNSUPPORTED_E2E_TESTS="httpoption"
 
-export ENVOY_GATEWAY_VERSION="v1.5.1"
+export ENVOY_GATEWAY_VERSION="v1.6.0"
 export ENVOY_GATEWAY_UNSUPPORTED_E2E_TESTS="httpoption,host-rewrite"