Update Rust crate reqwest to v0.12.21

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
reqwest	dependencies	patch	=0.12.20 -> =0.12.21

---

Release Notes

seanmonstar/reqwest (reqwest)

v0.12.21

• Fix socks proxy to use socks4a:// instead of socks4h://.
• Fix Error::is_timeout() to check for hyper and IO timeouts too.
• Fix request Error to again include URLs when possible.
• Fix socks connect error to include more context.
• (wasm) implement Default for Body.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.