the multipart crate is unmaintained

[decathorpe]

The multipart crate (a dependency of the "upload" feature) has not been updated in over two years, the GitHub project has been archived earlier this year, and it has been officially marked as "unmaintained" in the RustSec advisory database a few months ago.

As far as I can tell, almost all projects that previously used the multipart crate (including the axum, poem, rocket, and warp crates - so basically all popular Rust web frameworks) have migrated to multer, which is also listed as a maintained alternative to multipart.

However, I'm not sure if multer provides all the functionality that was available in multipart - notably, client-side support seems to be missing. It appears that the multipart crate is only needed as a dependency because ureq does not have built-in multipart support? In that case, switching to a different HTTP client library (like reqwest) that has multipart support built-in might be an alternative.

[messense]

At the moment I don't want to introduce tokio, futures and lots of other dependencies to maturin(through reqwest), I'd suggest asking ureq to add multipart support.