fix(deps): update rust crate axum to v0.8.6

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.8.4 -> 0.8.6

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Release Notes

tokio-rs/axum (axum)

v0.8.6

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v0.8.5: axum v0.8.5

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• fixed: Reject JSON request bodies with trailing characters after the JSON document (#​3453)
• added: Implement OptionalFromRequest for Multipart (#​3220)
• added: Getter methods Location::{status_code, location}
• added: Support for writing arbitrary binary data into server-sent events (#​3425)]
• added: middleware::ResponseAxumBodyLayer for mapping response body to axum::body::Body (#​3469)
• added: impl FusedStream for WebSocket (#​3443)
• changed: The sse module and Sse type no longer depend on the tokio feature (#​3154)
• changed: If the location given to one of Redirects constructors is not a valid header value, instead of panicking on construction, the IntoResponse impl now returns an HTTP 500, just like Json does when serialization fails (#​3377)
• changed: Update minimum rust version to 1.78 (#​3412)

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