Slackware 15.0: 2024-339-01 critical: python3 security update

Here are the details from the Slackware 15.0 ChangeLog: patches/packages/python3-3.9.21-i586-1_slack15.0.txz: Upgraded. This update fixes security issues: gh-126623: Upgraded libexpat to 2.6.4 to fix CVE-2024-50602. gh-122792: Changed IPv4-mapped ipaddress.IPv6Address to consistently use the mapped IPv4 address value for deciding properties. Properties which have their behavior fixed are is_multicast, is_reserved, is_link_local, is_global, and is_unspecified. gh-124651: Properly quote template strings in venv activation scripts. gh-103848: Added checks to ensure that [ bracketed ] hosts found by urllib.parse.urlsplit() are of IPv6 or IPvFuture format. gh-95588: Clarified the conflicting advice given in the ast documentation about ast.literal_eval() being safe for use on untrusted input while at the same time warning that it can crash the process. The latter statement is true and is deemed unfixable without a large amount of work unsuitable for a bugfix.