Bump libsqlite3-sys

[madadam]

Bumps libsqlite3-sys to v0.25.2 (which bumps sqlite to 3.40.1).

This seems to fix some random glitches that we've been experiencing when running our integration test suite so it would be great to have this merged soon.

I've also included @tyrelr's #2228 because it wouldn't compile without it.

[madadam]

Hm, there is a test failure here:

sqlx/tests/sqlite/describe.rs

Line 273 in ea2db6e

assert_eq!(info.nullable(0), Some(false), "{}", query);

. Wonder if the EXPLAIN format changed in the new sqlite version?

[CosmicHorrorDev]

See #2094

SQLite is already bumped to v0.25 on the v0.7 branch that is pending release