chore(deps): Update axum requirement from 0.7 to 0.8

Updates the requirements on [axum](https://github.com/tokio-rs/axum) to permit the latest version.
- [Release notes](https://github.com/tokio-rs/axum/releases)
- [Changelog](https://github.com/tokio-rs/axum/blob/main/CHANGELOG.md)
- [Commits](https://github.com/tokio-rs/axum/commits)

---
updated-dependencies:
- dependency-name: axum
  dependency-type: direct:production
...

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

Cargo.toml

@@ -60,7 +60,7 @@ unicase = "2.6"
 assert-json-diff = "2.0.2"
 async-std = "1.12"
 anyhow = "1.0"
-axum = "0.7"
+axum = "0.8"
 clap = { version = "4.0", features = ["derive"] }
 rstest = "0.24.0"
 docker_credential = "1.0"