Bump tokio from 1.38.1 to 1.40.0

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.38.1 to 1.40.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](tokio-rs/tokio@tokio-1.38.1...tokio-1.40.0)

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

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

Cargo.toml

@@ -46,7 +46,7 @@ serde-big-array = "0.5.1"
 sieve-cache = "0.2.1"
 siphasher = "1.0.1"
 slabigator = "0.9.2"
-tokio = { version = "1.38.1", features = [
+tokio = { version = "1.40.0", features = [
   "net",
   "io-std",
   "io-util",