chore(deps): bump axum-test from 20.1.0 to 21.0.0 in /bots/echidnabot (#345)

Bumps [axum-test](https://github.com/JosephLenton/axum-test) from 20.1.0
to 21.0.0.
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/JosephLenton/axum-test/commits">compare
view</a></li>
</ul>
</details>
<br />


[![Dependabot compatibility
score](https://dependabot-badges.githubapp.com/badges/compatibility_score?dependency-name=axum-test&package-manager=cargo&previous-version=20.1.0&new-version=21.0.0)](https://docs.github.com/en/github/managing-security-vulnerabilities/about-dependabot-security-updates#about-compatibility-scores)

Dependabot will resolve any conflicts with this PR as long as you don't
alter it yourself. You can also trigger a rebase manually by commenting
`@dependabot rebase`.

[//]: # (dependabot-automerge-start)
[//]: # (dependabot-automerge-end)

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot recreate` will recreate this PR, overwriting any edits
that have been made to it
- `@dependabot show <dependency name> ignore conditions` will show all
of the ignore conditions of the specified dependency
- `@dependabot ignore this major version` will close this PR and stop
Dependabot creating any more for this major version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this minor version` will close this PR and stop
Dependabot creating any more for this minor version (unless you reopen
the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop
Dependabot creating any more for this dependency (unless you reopen the
PR or upgrade to it yourself)


</details>

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jonathan D.A. Jewell <6759885+hyperpolymath@users.noreply.github.com>

Author: dependabot[bot]

bots/echidnabot/Cargo.lock

@@ -78,7 +78,7 @@ urlencoding = "2.1.3"
 [dev-dependencies]
 criterion = { version = "0.8.2", features = ["html_reports"] }
 tokio-test = "0.4.5"
-axum-test = "20.1.0"
+axum-test = "21.0.0"
 mockall = "0.14.0"
 tempfile = "3.27.0"
 wiremock = "0.6.5"