Fix minimal dependency versions

[Jarema]

While investing something else in nats.rs library, after running

cargo +nightly update -Zminimal-versions
cargo check  --all-targets

I found some errors in this repo minimum versions.
This bumps them to the required minimum.

Signed-off-by: Tomasz Pietrek [email protected]

[djc]

Thanks!

[cpu]

Thank you