cad/{,py-}gdstk: Update 0.9.60 => 0.9.61

Changelogs:

• https://github.com/heitzmann/gdstk/blob/v0.9.61/CHANGELOG.md
• https://github.com/heitzmann/gdstk/compare/v0.9.60...v0.9.61

• Add second WWW for source code repository
• Pet portclippy(1) and portfmt(1)

Approved by: yuri@ (maintainer, Mentor)
Differential Revision: https://reviews.freebsd.org/D53251