I hope to update rustls-native-certs to version 0.8 soon.
The version of rust-imap-client currently in debian already
uses 0.8 upstream and the patched cargo dependency already
allows both versions, so I initially thought this would
just be a case of updating the debian dependency.

However, upon testing I discovered that code introduced by
2001_tokio-rustls.patch needed adjustment to build
successfully with rustls-native-certs 0.8.

debdiff is attached.