Bump tokio from 1.20.1 to 1.20.4 (#14)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.20.1 to 1.20.4.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.20.1...tokio-1.20.4

)

---
updated-dependencies:
- dependency-name: tokio
  dependency-type: direct:production
...

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

Cargo.lock

@@ -987,16 +987,15 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.20.1"
+version = "1.20.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7a8325f63a7d4774dd041e363b2409ed1c5cbbd0f867795e661df066b2b0a581"
+checksum = "eb78f30e4b41e98ca4cce5acb51168a033839a7af9e42b380355808e14e98ee0"
 dependencies = [
  "autocfg",
  "bytes",
  "libc",
  "mio",
  "num_cpus",
- "once_cell",
  "pin-project-lite",
  "signal-hook-registry",
  "socket2",

Cargo.toml

@@ -8,7 +8,7 @@ lustre_collector = "0.6"
 num-traits = "0.2.14"
 prometheus = "0.13.0"
 prometheus_exporter_base = { version = "1.3.0", features = ["hyper_server"] }
-tokio = { version = "1.17.0", features = [
+tokio = { version = "1.20.4", features = [
     "rt-multi-thread",
     "macros",
     "process",