Bump idna from 0.3.0 to 0.4.0

Bumps [idna](https://github.com/servo/rust-url) from 0.3.0 to 0.4.0.
- [Release notes](https://github.com/servo/rust-url/releases)
- [Commits](servo/rust-url@v0.3.0...v0.4.0)

---
updated-dependencies:
- dependency-name: idna
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -39,7 +39,7 @@ speedate = "0.11.0"
 ahash = "0.8.0"
 url = "2.3.1"
 # idna is already required by url, added here to be explicit
-idna = "0.3.0"
+idna = "0.4.0"
 base64 = "0.13.1"
 num-bigint = "0.4.3"
 python3-dll-a = "0.2.7"