Racket v8.17 release has started

The release process for v8.17 will begin in about a week.  If you
have any new features that you want in and are relatively close to
to being done, now is a good time to do that.

Upcoming dates:
- 7th:  Branch day, merge window starts
- 15th: Merge window ends, testing starts
- 22nd: Testing ends
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