cargo: bump async-trait from 0.1.50 to 0.1.51 (#2572)

Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.50 to 0.1.51.
- [Release notes](https://github.com/dtolnay/async-trait/releases)
- [Commits](https://github.com/dtolnay/async-trait/compare/0.1.50...0.1.51)

---
updated-dependencies:
- dependency-name: async-trait
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

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

Cargo.lock

@@ -409,9 +409,9 @@ checksum = "e91831deabf0d6d7ec49552e489aed63b7456a7a3c46cff62adad428110b0af0"
 
 [[package]]
 name = "async-trait"
-version = "0.1.50"
+version = "0.1.51"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b98e84bbb4cbcdd97da190ba0c58a1bb0de2c1fdf67d159e192ed766aeca722"
+checksum = "44318e776df68115a881de9a8fd1b9e53368d7a4a5ce4cc48517da3393233a5e"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -22,7 +22,7 @@ async-smtp = { git = "https://github.com/async-email/async-smtp", branch="master
 async-std-resolver = "0.20.3"
 async-std = { version = "~1.9.0", features = ["unstable"] }
 async-tar = "0.3.0"
-async-trait = "0.1.50"
+async-trait = "0.1.51"
 backtrace = "0.3.59"
 base64 = "0.13"
 bitflags = "1.3.1"