Update to Comrak 0.49.0, add data-checkbox-sourcepos

Asherah Connorrequested to merge
push-srtqswxttvok into main

This MR adds data-checkbox-sourcepos to task list checkboxes to enable precise source position tracking for the checkbox symbol itself (i.e. the x in [x], or the ~ in [~]).

Edited by Asherah Connor

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