Update libsqlite3-sys to `0.34.0`

[partylikeits1983]

Does your PR solve an issue?

Yes. This PR resolves a version conflict between sqlx and other dependencies (like rusqlite) caused by incompatible versions of the libsqlite3-sys crate, which links the native SQLite library. Cargo requires only one version of such native-linking crates in the dependency graph.

By updating sqlx to use a compatible libsqlite3-sys version, this conflict is eliminated, allowing both libraries to coexist in the project.

Is this a breaking change?

No. This change only updates internal dependencies to align native library versions without changing any public APIs or behavior.