Update axum requirement from 0.6.1 to 0.7.3

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-v0.6.1...axum-v0.7.3)

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

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

Cargo.toml

@@ -17,7 +17,7 @@ tracing-opentelemetry = "0.21.0"
 
 # Tokio to Axum and all that's in between.
 tokio = { version = "1", features = ["full"] }
-axum = "0.6.1"
+axum = "0.7.3"
 tower = { version = "0.4.11", features = ["limit", "load-shed", "timeout"] }
 tower-http = { version = "0.4.0", features = ["trace", "compression-full", "validate-request"] }
 hyper = "0.14.17"