Bump discard requirement

[jarednorman]

Discard v2 slightly changes how transactions and callbacks interact to be more consistent with how they work with operations like delete in ActiveRecord. I don't know if we depend on that behaviour, but we should lock ourselves to the more correct behaviour, in case it matters.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.68%. Comparing base (4e00cb1) to head (b74d3a1).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6488   +/-   ##
=======================================
  Coverage   89.68%   89.68%           
=======================================
  Files         992      992           
  Lines       20846    20846           
=======================================
  Hits        18695    18695           
  Misses       2151     2151           

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