CLEANSTART-2026-EN93855 Security fixes in rekor-backfill-index 1.4.3-r2

Package rekor-backfill-index version 1.4.3-r2 fixes 3 vulnerabilities: ghsa-fw7p-63qq-7hpr, CVE-2026-26958, ghsa-mqqf-5wvp-8fh8...