Bump github/dependabot-update-job-proxy/dependabot-update-job-proxy from v2.0.20230825174152 to v2.0.20230921204854 in /docker

Bump github/dependabot-update-job-proxy/dependabot-update-job-proxy from v2.0.20230825174152 to v2.0.20230921204854 in /docker #5431