Bump tokio from 1.50.0 to 1.51.1

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.50.0 to 1.51.1.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.50.0...tokio-1.51.1)

---
updated-dependencies:
- dependency-name: tokio
  dependency-version: 1.51.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

Cargo.lock

@@ -48,7 +48,7 @@ sieve-cache = "1.1.6"
 siphasher = "1.0.2"
 slabigator = "0.9.5"
 socket2 = "0.6.3"
-tokio = { version = "1.50.0", features = [
+tokio = { version = "1.51.1", features = [
   "net",
   "io-std",
   "io-util",