Bump tokio in /code-samples/community/serving/helloworld-rust (#6246)

Bumps [tokio](https://github.com/tokio-rs/tokio) from 1.33.0 to 1.38.2.
- [Release notes](https://github.com/tokio-rs/tokio/releases)
- [Commits](https://github.com/tokio-rs/tokio/compare/tokio-1.33.0...tokio-1.38.2)

---
updated-dependencies:
- dependency-name: tokio
  dependency-version: 1.38.2
  dependency-type: direct:production
...

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

code-samples/community/serving/helloworld-rust/Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 3
+version = 4
 
 [[package]]
 name = "addr2line"
@@ -493,9 +493,9 @@ dependencies = [
 
 [[package]]
 name = "tokio"
-version = "1.33.0"
+version = "1.38.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4f38200e3ef7995e5ef13baec2f432a6da0aa9ac495b2c0e8f3b7eec2c92d653"
+checksum = "68722da18b0fc4a05fdc1120b302b82051265792a1e1b399086e9b204b10ad3d"
 dependencies = [
  "backtrace",
  "bytes",
@@ -510,9 +510,9 @@ dependencies = [
 
 [[package]]
 name = "tokio-macros"
-version = "2.1.0"
+version = "2.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "630bdcf245f78637c13ec01ffae6187cca34625e8c63150d424b59e55af2675e"
+checksum = "5f5ae998a069d4b5aba8ee9dad856af7d520c3699e6159b185c2acd48155d39a"
 dependencies = [
  "proc-macro2",
  "quote",

code-samples/community/serving/helloworld-rust/Cargo.toml

@@ -6,5 +6,5 @@ publish = false
 
 [dependencies]
 hyper = { version = "0.14.27", features = ["full"]}
-tokio = { version = "1.33.0", features = ["macros", "rt-multi-thread"] }
+tokio = { version = "1.38.2", features = ["macros", "rt-multi-thread"] }
 pretty_env_logger = "0.5.0"