Bump tower-http from 0.3.5 to 0.4.0 (paritytech#14128)

Bumps [tower-http](https://github.com/tower-rs/tower-http) from 0.3.5 to 0.4.0.
- [Release notes](https://github.com/tower-rs/tower-http/releases)
- [Commits](tower-rs/tower-http@tower-http-0.3.5...tower-http-0.4.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

client/rpc-servers/Cargo.toml

@@ -18,6 +18,6 @@ log = "0.4.17"
 serde_json = "1.0.85"
 tokio = { version = "1.22.0", features = ["parking_lot"] }
 prometheus-endpoint = { package = "substrate-prometheus-endpoint", version = "0.10.0-dev", path = "../../utils/prometheus" }
-tower-http = { version = "0.3.4", features = ["cors"] }
+tower-http = { version = "0.4.0", features = ["cors"] }
 tower = "0.4.13"
 http = "0.2.8"