Update auto-deploy-image to v0.8.3 for DAST default branch deploy

changelogs/unreleased/update_dast_default_branch.yml

+---
+title: Update auto-deploy-image to v0.8.3 for DAST default branch deploy
+merge_request: 22227
+author:
+type: changed

lib/gitlab/ci/templates/Jobs/DAST-Default-Branch-Deploy.gitlab-ci.yml

 .dast-auto-deploy:
-  image: "registry.gitlab.com/gitlab-org/cluster-integration/auto-deploy-image:v0.6.0"
+  image: "registry.gitlab.com/gitlab-org/cluster-integration/auto-deploy-image:v0.8.3"
 
 dast_environment_deploy:
   extends: .dast-auto-deploy