Update gcr.io/kaniko-project/executor Docker tag to v1.9.1

.gitlab-ci.yml

@@ -36,7 +36,7 @@ build:
   image:
     # We need a shell to provide the registry credentials, so we need to use the
     # kaniko debug image (https://github.com/GoogleContainerTools/kaniko#debug-image)
-    name: gcr.io/kaniko-project/executor:v1.9.0-debug
+    name: gcr.io/kaniko-project/executor:v1.9.1-debug
     entrypoint: [""]
   script:
     - echo $CI_COMMIT_SHORT_SHA