build(deps): bump async-trait from 0.1.79 to 0.1.81

Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.79 to 0.1.81.
- [Release notes](https://github.com/dtolnay/async-trait/releases)
- [Commits](dtolnay/async-trait@0.1.79...0.1.81)

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

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

Cargo.toml

@@ -21,7 +21,7 @@ authors = ["DaSCH - Swiss National Data and Service Center for the Humanities"]
 
 [workspace.dependencies]
 anyhow = "1"
-async-trait = "0.1.68"
+async-trait = "0.1.81"
 axum = "0.7.2" # web framework
 axum-macros = "0.4.0"
 clap = { version = "4.5.4", features = ["derive"] } # command-line parser