Log Message:
snac: update to 2.64. Changes:

Some tweaks for better integration with https://bsky.brid.gy (the
BlueSky bridge by brid.gy).

A corner case bug in the media proxying code has been fixed.

Hashtags can now include underscores.

The server now creates a pidfile inside the data directory.

Mastodon API: fixed a crash in the notification code, fixed
autocapitalization in the OAuth login field (contributed by fkooman).