multimedia/mkvtoolnix: Update to upstream release 69.0.0

Details:
- Fixes and enhancements, see:
  https://mkvtoolnix.download/doc/NEWS.md
- Consistent use of American English in program options as well as JSON
  structures. This is a potentially breaking change, but as these
  have been introduced just recently in 68.0.0 end of May, the expected
  number of affected users is reasonably low.

MFH:		2022Q3
(cherry picked from commit 40da840a)