fix(deps): update rust crate async-std to 1.12.0 (#15)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [async-std](https://async.rs) ([source](https://github.com/async-rs/async-std)) | dependencies | minor | `1.9.0` -> `1.12.0` |

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Cargo.lock

@@ -191,9 +191,9 @@ dependencies = [
 
 [[package]]
 name = "async-std"
-version = "1.9.0"
+version = "1.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d9f06685bad74e0570f5213741bea82158279a4103d988e57bfada11ad230341"
+checksum = "62565bb4402e926b29953c785397c6dc0391b7b446e45008b0049eb43cec6f5d"
 dependencies = [
  "async-channel",
  "async-global-executor",
@@ -208,7 +208,6 @@ dependencies = [
  "kv-log-macro",
  "log 0.4.21",
  "memchr",
- "num_cpus",
  "once_cell",
  "pin-project-lite",
  "pin-utils",

Cargo.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 
 [dependencies]
 # atty = "0.2.14"
-async-std = "1.9.0"
+async-std = "1.12.0"
 base64 = "0.13.0"
 chrono = "0.4.35"
 clap = { version = "2.33.3", features = ["yaml"] }