Update Rust crate axum to 0.7.3

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.7.2 -> 0.7.3

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Release Notes

tokio-rs/axum (axum)

### [`v0.7.3`](https://togithub.com/tokio-rs/axum/releases/tag/axum-v0.7.3): axum - v0.7.3 [Compare Source](https://togithub.com/tokio-rs/axum/compare/axum-v0.7.2...axum-v0.7.3) - **added:** `Body` implements `From<()>` now ([#​2411]) - **change:** Update version of multer used internally for multipart ([#​2433]) - **change:** Update tokio-tungstenite to 0.21 ([#​2435]) - **added:** Enable `tracing` feature by default ([#​2460]) - **added:** Support graceful shutdown on `serve` ([#​2398]) - **added:** `RouterIntoService` implements `Clone` ([#​2456]) [#​2411]: https://togithub.com/tokio-rs/axum/pull/2411 [#​2433]: https://togithub.com/tokio-rs/axum/pull/2433 [#​2435]: https://togithub.com/tokio-rs/axum/pull/2435 [#​2460]: https://togithub.com/tokio-rs/axum/pull/2460 [#​2398]: https://togithub.com/tokio-rs/axum/pull/2398 [#​2456]: https://togithub.com/tokio-rs/axum/pull/2456

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