Bump tokio-tungstenite from 0.20.1 to 0.21.0

Bumps [tokio-tungstenite](https://github.com/snapview/tokio-tungstenite) from 0.20.1 to 0.21.0.
- [Changelog](https://github.com/snapview/tokio-tungstenite/blob/master/CHANGELOG.md)
- [Commits](snapview/tokio-tungstenite@v0.20.1...v0.21.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Cargo.lock

@@ -109,7 +109,7 @@ rdkafka-sys = { version = "4.6", optional = true, features = [
 indexmap = { version = "2", optional = true, default-features = false }
 
 # websockets
-tokio-tungstenite = { version = "0.20", optional = true, default-features = false, features = [
+tokio-tungstenite = { version = "0.21", optional = true, default-features = false, features = [
     "handshake",
 ] }