Update Rust crate axum to v0.7.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.7.7 -> 0.7.8

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Release Notes

tokio-rs/axum (axum)

### [`v0.7.8`](https://redirect.github.com/tokio-rs/axum/releases/tag/axum-v0.7.8): axum - v0.7.8 [Compare Source](https://redirect.github.com/tokio-rs/axum/compare/axum-v0.7.7...axum-v0.7.8) - **fixed:** Skip SSE incompatible chars of `serde_json::RawValue` in `Event::json_data` ([#​2992]) - **added:** Add `method_not_allowed_fallback` to set a fallback when a path matches but there is no handler for the given HTTP method ([#​2903]) - **added:** Add `MethodFilter::CONNECT`, `routing::connect[_service]` and `MethodRouter::connect[_service]` ([#​2961]) - **added:** Add `NoContent` as a self-described shortcut for `StatusCode::NO_CONTENT` ([#​2978]) [#​2903]: https://redirect.github.com/tokio-rs/axum/pull/2903 [#​2961]: https://redirect.github.com/tokio-rs/axum/pull/2961 [#​2978]: https://redirect.github.com/tokio-rs/axum/pull/2978 [#​2992]: https://redirect.github.com/tokio-rs/axum/pull/2992

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