Vim: v9.1.1904

* vim aa9862a5b...54cc82012 (7):
  > runtime(doc): Update Section 4 of vim9.txt
  > runtime(sml): Fix number regex in syntax script
  > patch 9.1.1904: Code still supports GTK2 versions older than 2.4
  > patch 9.1.1903: GTK naming still reflects GTK1 support
  > patch 9.1.1902: GTK fails to compile with !FEAT_PROP_POPUP
  > runtime(vim): Update base syntax, fix :augroup error matching
  > runtime(doc): Improve windows.txt formatting

https://github.com/vim/vim-appimage/actions/runs/19251620700

Author: github-actions[bot]