[issue42862] Use functools.lru_cache iso. _sqlite.Cache in sqlite3 module

[Erlend Egeberg Aasland]

Erlend Egeberg Aasland <erlend.aasland at innova.no> added the comment:

> Or is it ok to call gc.collect() in the test suite?

Seems like it's ok:

$ grep -r gc.collect Lib/test | wc -l
    366

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