dotenvy is the maintained fork recommended in RUSTSEC-2021-0141

[bh2smith]

Resolving this warning:

error[unmaintained]: dotenv is Unmaintained
    ┌─ /github/workspace/Cargo.lock:325:1
    │
325 │ dotenv 0.15.0 registry+https://github.com/rust-lang/crates.io-index
    │ ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ unmaintained advisory detected
    │
    ├ ID: RUSTSEC-2021-0141
    ├ Advisory: https://rustsec.org/advisories/RUSTSEC-2021-0141
    ├ dotenv by description is meant to be used in development or testing only.

[cursor]

PR Summary

Low Risk
Dependency swap for .env loading with no behavioral changes expected beyond the underlying crate implementation.

Overview
Updates the crate to use dotenvy instead of the unmaintained dotenv dependency, including switching the import in src/client.rs and updating the from_env docs to reference the new crate.

^{Written by Cursor Bugbot for commit d315f35. Configure here.}