feat: Update dependencies to latest major versions

Performs a comprehensive update of project dependencies, bumping many to their latest major versions.

This update involves:
*   Upgrading core libraries like `clap`, `serde`, `toml`, `aes-gcm`, `rand`, and `ureq`.
*   Adapting the codebase to reflect breaking API changes in updated crates (e.g., `aes-gcm`, `rand`, `hmac`, `sha1`, `ureq`).
*   Removing several direct dependencies (e.g., `anyhow`, `atty`, `ctrlc`, `thiserror`) that are either no longer directly required or have been absorbed by transitive updates.

This ensures the project remains up-to-date with the latest Rust ecosystem, benefiting from improved security, performance, and features.

Author: SimonDevelop