Bump tokio from 1.20.1 to 1.21.0

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.20.1 to 1.21.0.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.20.1...tokio-1.21.0)

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

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

Cargo.lock

@@ -1011,9 +1011,9 @@ checksum = "cda74da7e1a664f795bb1f8a87ec406fb89a02522cf6e50620d016add6dbbf5c"
 
 [[package]]
 name = "tokio"
-version = "1.20.1"
+version = "1.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"
+checksum = "89797afd69d206ccd11fb0ea560a44bbb87731d020670e79416d442919257d42"
 dependencies = [
  "autocfg",
  "bytes",

Cargo.toml

@@ -46,7 +46,7 @@ serde_derive = "1.0.144"
 serde-big-array = "0.4.1"
 siphasher = "0.3.10"
 slabigator = "0.2.0"
-tokio = { version = "1.20.1", features = [
+tokio = { version = "1.21.0", features = [
   "net",
   "io-std",
   "io-util",