Automator: update [email protected] in istio/[email protected] (#2434)

Author: istio-testing

common/.commonfiles.sha

@@ -1 +1 @@
-a1d5c4198ab79a14c09c034f2d95245efa3e2bcb
+67d754ffd29418ea77d123787bb89c35ed2f6adb

common/scripts/setup_env.sh

@@ -75,7 +75,7 @@ fi
 TOOLS_REGISTRY_PROVIDER=${TOOLS_REGISTRY_PROVIDER:-gcr.io}
 PROJECT_ID=${PROJECT_ID:-istio-testing}
 if [[ "${IMAGE_VERSION:-}" == "" ]]; then
-  IMAGE_VERSION=master-fcd42145fc132acd1e8f607e9e7aca15058e9fb9
+  IMAGE_VERSION=release-1.26-fcd42145fc132acd1e8f607e9e7aca15058e9fb9
 fi
 if [[ "${IMAGE_NAME:-}" == "" ]]; then
   IMAGE_NAME=build-tools