Note: rusqlite v0.25.2 has been yanked because it accidentally enabled bundled-full as a default feature. v0.25.3 has been cut that is equivalent but without that change. The libsqlite3-sys release that happened at the same time is still fine.
This release is a patch release that enables builds on some older versions of Rust. Rusqlite does not commit to a particular MSRV, but this release is known to work at least back to Rust 1.41.0.
It is likely that the next release will require a newer version of Rust, whether or not it is mentioned in the release notes.