www/gohugo: Update to 0.159.2
ChangeLog: https://github.com/gohugoio/hugo/releases/tag/v0.159.2
- Fix potential content XSS by escaping dangerous URLs in Markdown links and images.
- resources/page: Fix shared reader in Source.ValueAsOpenReadSeekCloser.
Approved by: doceng@ (implicit)
MFH: 2026Q2 security issue
(cherry picked from commit c36ab384a66b1084458a4933874924e62fe1caf1)