[typemap] typemap is Unmaintained

The maintainer seems unreachable. The crate may or may not be usable as-is despite no maintenance and may not work in future versions of Rust. The last release seems to have been seven years ago.

References

• https://github.com/reem/rust-typemap/issues/45
• https://rustsec.org/advisories/RUSTSEC-2019-0039.html
• https://github.com/advisories/GHSA-vfv3-9w6v-23jp