[issue40744] Explicitly drop support for SQLite version < 3.7.3

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


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versions:  -Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40744>
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