Bump cmd-help syntax to latest

This update includes an overhaul of scope names to better support the
set of themes included with bat.

You can find a visual diff for every theme in this PR:
https://github.com/victor-gp/cmd-help-sublime-syntax/pull/17

This commit updates the cmd-help syntax test because the scopes (-> colors)
have changed.

CHANGELOG.md

@@ -22,6 +22,7 @@
 - Added a new VimHelp syntax, see #2366 (@Freed-Wu)
 - Associate `pdm.lock` with `TOML` syntax, see #2410
 - `Todo.txt`: Fix highlighting of contexts and projects at beginning of done.txt, see #2411
+- `cmd-help`: overhaul scope names (colors) to improve theme support; misc syntax improvements. See #2419 (@victor-gp)
 
 ## Themes