cargo: bump async-std from 1.9.0 to 1.10.0

Bumps [async-std](https://github.com/async-rs/async-std) from 1.9.0 to 1.10.0.
- [Release notes](https://github.com/async-rs/async-std/releases)
- [Changelog](https://github.com/async-rs/async-std/blob/master/CHANGELOG.md)
- [Commits](https://github.com/async-rs/async-std/compare/v1.9.0...v1.10.0)

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

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

Cargo.toml

@@ -20,7 +20,7 @@ async-imap = { git = "https://github.com/async-email/async-imap" }
 async-native-tls = { version = "0.3.3" }
 async-smtp = { git = "https://github.com/async-email/async-smtp", branch="master", features = ["socks5"] }
 async-std-resolver = "0.20.3"
-async-std = { version = "~1.9.0", features = ["unstable"] }
+async-std = { version = "~1.10.0", features = ["unstable"] }
 async-tar = "0.3.0"
 async-trait = "0.1.51"
 backtrace = "0.3.59"
@@ -77,7 +77,7 @@ humansize = "1.1.1"
 
 [dev-dependencies]
 ansi_term = "0.12.0"
-async-std = { version = "1.9.0", features = ["unstable", "attributes"] }
+async-std = { version = "1.10.0", features = ["unstable", "attributes"] }
 criterion = "0.3"
 futures-lite = "1.12.0"
 log = "0.4.11"