Update SQLite to v3.50.2

[siiky]

Hi!

I updated the SQLite code to the latest version, v3.50.2. The egg still compiles and the tests pass. For what I'm using sql-de-lite it's also working.

I updated because the previous version (v3.31?) didn't support RETURNING on INSERT statements.

If you'd like to bump the published library, feel free to merge. If not, that's also fine, feel free to close the PR. :)

[siiky]

Sorry, the tests do pass but I was forgetting about this detail:

-- testing rollback ----------------------------------------------------------
Open read queries do not prevent SQL ROLLBACK ........................ [ PASS]
Open read queries ok with SQL COMMIT ................................. [ PASS]
(rollback) resets open cached queries ................................
Warning: (rollback) internal error: at least one transaction frame is missing
[ PASS]
(rollback) resets open transient queries (and warns) .................
Warning: (rollback) internal error: at least one transaction frame is missing
[ PASS]
with-transaction rollback resets open queries ........................ [ PASS]
5 tests completed in 0.002 seconds.
5 out of 5 (100%) tests passed.
-- done testing rollback -----------------------------------------------------

Haven't looked further yet to know if it's anything to worry about. (I'm using transactions in my thing as well and haven't noticed this warning yet)