Latest Lexgen (#1088)
This is to pull in the latest requirement changes via
https://github.com/bluesky-social/atproto/pull/3882, specifically the
"via repost" changes.
After running `make lexgen`, there were several other changes that were
deprecated, so I did not commit those. Happy to add them back if that's
the preferred way of doing things, but doing so led to some lexgen
weirdness, so I decided to leave them off for now to continue making
progress.
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