Play Framework

chore: untrack framework/src/play/version build artifact

The file is regenerated by ant jar from the baseversion property and
removed by ant clean — already in .gitignore but tracked from before
the ignore rule was added. Untracking it stops every clean from
leaving the working tree dirty. Also drop the matching reference from
the /deploy slash command.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>