lang/python314: Fix incomplete mitigation of webbrowser.open()

Cherry-pick fix to resolve
Incomplete mitigation of CVE-2026-4519,
%action expansion for command injection to webbrowser.open()

Obtained from: GitHub repo

		https://github.com/python/cpython/pull/148516

Security: CVE-2026-4786

		cf75f572-378a-11f1-a119-e36228bfe7d4