Bump Sentry Rust Dependencies

We are using sentry in a rust project, but need to update our ring crate to 0.16. However, Sentry’s dependency tree is pinned to ring 0.14 (via rustls 0.15, hyper-rustls 0.16, and reqwest 0.9.15).

I believe bumping reqwest to the latest: 0.9.19 would fix this!

Should we make a github issue?