chore: update dependencies in Cargo.toml and do not require tokio default features

[sasa-tomic]

Description

Bump up dependency versions in Cargo.{toml,lock}, and disable project dependency on default tokio features since they do not seem to be required for agent-rs itself.

How Has This Been Tested?

By running cargo build and cargo test and confirming they still succeed.

Checklist:

• The title of this PR complies with Conventional Commits.
• I have edited the CHANGELOG accordingly.
• I have made corresponding changes to the documentation.