Update axum requirement from 0.6.20 to 0.7.1

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-v0.6.20...axum-v0.6.20)

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

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

Cargo.toml

@@ -6,7 +6,7 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.75"
 async-stripe = { version = "0.25.2", default-features = false, features = ["runtime-tokio-hyper-rustls", "billing", "connect", "webhook-events", "uuid", "stream", "checkout"] }
-axum = { version = "0.6.20", features = ["http2", "headers"] }
+axum = { version = "0.7.1", features = ["http2", "headers"] }
 chrono = { version = "0.4.31", features = ["serde"] }
 dashmap = "5.5.3"
 dotenvy = "0.15.7"