gh-92547: Remove deprecated sqlite3 features (#92548)

The following sqlite3 features were deprecated in 3.10, scheduled for
removal in 3.12:

- sqlite3.OptimizedUnicode (gh-23163)
- sqlite3.enable_shared_cache (gh-24008)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Signed-off-by: Erlend E. Aasland <erlend.aasland@protonmail.com>