CLEANSTART-2026-GX16359 Security fixes in confluent-common-docker 7.6.9-r3

Package confluent-common-docker version 7.6.9-r3 fixes 4 vulnerabilities: CVE-2025-11226, CVE-2026-1225, ghsa-25qh-j22f-pwp8, ghsa-qqpg-mvqg-649v...