CLSA-2026-1777940906 python2: Fix of 3 CVEs

CVE-2025-8194: validate that tarfile member offsets are non-negative to prevent infinite loop / DoS during parsing of malicious tar archives - CVE-2026-4519: reject URLs with leading dashes in webbrowser.open to prevent injection of command-line options into spawned browser process -...

CLSA-2026-1777884819 python3.9: Fix of CVE-2026-4786

CVE-2026-4786: fix webbrowser %action substitution bypass of the dash-prefix safety check by validating the post-substitution URL and expanding %action before %s in UnixBrowser argument assembly...