Sqlite3 timestamp converter is deprecated as of Python 3.12

[jsstevenson]

I can circle back and flesh this one out in greater detail later (trying to get something else done currently, but wanted to put it on paper before I forget).

Describe the bug
Core sequence retrieval operations trigger a warning: DeprecationWarning: The default timestamp converter is deprecated as of Python 3.12; see the sqlite3 documentation for suggested replacement recipes. The traceback I'm getting isn't super informative since it's just the cursor, but there's more information provided in the stdlib docs.

To Reproduce
(Any sequence lookup)

Expected behavior
Something from here, apparently

[bwalsh]

Observed this as well.