v0.8.0

With this version, the new Replica::pending_tasks method returns all pending tasks efficiently, avoiding the need to individually fetch each task in the working set.

This version introduces a few new Cargo features:

• sync - enables all of the sync features above
• bundled - activates bundling system libraries like sqlite
• tls-native-roots - use native (system) TLS roots, instead of those bundled with rustls, by
  (indirectly) enabling the rustls feature rustls-tls-native-roots.

The MSRV is now rust-1.73.0.