⬆️ Update axum requirement from 0.6 to 0.7 (#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](tokio-rs/axum@axum-v0.6.0...axum-v0.6.20)

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

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

Cargo.toml

@@ -22,7 +22,7 @@ readme = "README.md"
 cfg-if = "1.0"
 dirs = "5.0"
 faccess = "0.2.4"
-axum = { version = "0.6", features=["headers"] }
+axum = { version = "0.7", features=["headers"] }
 async-trait = "0.1"
 futures = "0.3"
 hyper = { version = "1.0", features = ["client"]}