chore(deps): update rust crate axum-test to v20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum-test	dev-dependencies	major	18.0 → 20.0

---

Release Notes

JosephLenton/axum-test (axum-test)

v19.1.0

Compare Source

• Remove TestServer::scheme, as it never actually worked with http requests only mocked requests.
• Remove TestRequest::scheme, as it never actually worked with http requests only mocked requests.
• Mocked transport no longer provides the scheme and authority to the service, which matches the behaviour with Tokio / Hyper based services.
• Mocked now provides the HOST header, which matches the behaviour with Hyper based HTTP services.

v19.0.0

• Simplified constructors for TestServer, TestServerBuilder, and TestServerConfig.
  • new() constructor no longer returns a Result, and instead panics on failure.
  • Added try_new() to allow people to continue to catch the Result if needed.
• TestResponse assertion functions now return &self, allowing calls to be chained!
• Requests using Reqwest will now share cookies with regular Axum Test requests.
  • Cookies saved by one are saved to the other, and both adhere to TestServer::save_cookies() and TestServer::do_not_save_cookies() commands.
• Improved error messages across the API.
  • JSON and Yaml assertions now output the body of the request when they fail.
• Removed deprecated feature old-json-diff.

---

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.