build(deps): bump anstream from 0.6.20 to 0.6.21

Bumps [anstream](https://github.com/rust-cli/anstyle) from 0.6.20 to 0.6.21.
- [Commits](rust-cli/anstyle@anstream-v0.6.20...anstream-v0.6.21)

---
updated-dependencies:
- dependency-name: anstream
  dependency-version: 0.6.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Cargo.lock

@@ -16,7 +16,7 @@ homepage = "https://github.com/ryanccn/am"
 repository = "https://github.com/ryanccn/am.git"
 
 [dependencies]
-anstream = "0.6.20"
+anstream = "0.6.21"
 async-trait = "0.1.89"
 chrono = "0.4.42"
 clap = { version = "4.5.48", features = ["derive"] }