[dev-context] CGModules update: vim syntax highlighting version 2020.06.25 published.

Aditya Mahajan submitted an update to the vim syntax highlighting package. Version number: 2020.06.25 License type: BSD License (simplified) Wants to be in ConTeXt distribution: yes Wants to be synced with CTAN: yes Summary description: This module uses Vim editor's syntax files to syntax highlight verbatim code in ConTeXt Announcement text: ---------------------------------------------------------------------- This is a bug-fix of the previous bug-fix The previous fix vim-2020.06.23 inadventently introduced a bug. The name of the color gets stored as a macro rather than the expanded value. Added an explicit `\expand` fixed this. ----------------------------------------------------------------------