Updated versions. No Cargo audit vulnerabilities anymore.

[dotbg]

% cargo audit                                                                                                                                                     
    Fetching advisory database from `https://github.com/RustSec/advisory-db.git`
      Loaded 561 security advisories (from ~/.cargo/advisory-db)
    Updating crates.io index
    Scanning Cargo.lock for vulnerabilities (182 crate dependencies)

Additionally moved from unmaintained dotenv to dotenvy

[dotbg]

@ThouCheese could you, please, have a look. Thanks a lot