Update Rust crate axum to 0.6.12

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.6.4 -> 0.6.12

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Release Notes

tokio-rs/axum

v0.6.12: axum - v0.6.12

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• added: Implement IntoResponse for MultipartError (#​1861)
• fixed: More clearly document what wildcards matches (#​1873)

v0.6.11: axum - v0.6.11

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• fixed: Don't require S: Debug for impl Debug for Router<S> (#​1836)
• fixed: Clone state a bit less when handling requests (#​1837)
• fixed: Unpin itoa dependency (#​1815)

v0.6.10: axum - v0.6.10

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• fixed: Add #[must_use] attributes to types that do nothing unless used (#​1809)
• fixed: Gracefully handle missing headers in the TypedHeader extractor (#​1810)
• fixed: Fix routing issues when loading a Router via a dynamic library (#​1806)

v0.6.9: axum - v0.6.9

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• changed: Update to tower-http 0.4. axum is still compatible with tower-http 0.3 (#​1783)

v0.6.8: axum - v0.6.8

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• fixed: Fix Allow missing from routers with middleware (#​1773)
• added: Add KeepAlive::event for customizing the event sent for SSE keep alive (#​1729)

v0.6.7: axum - v0.6.7

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• added: Add FormRejection::FailedToDeserializeFormBody which is returned
  if the request body couldn't be deserialized into the target type, as opposed
  to FailedToDeserializeForm which is only for query parameters (#​1683)
• added: Add MockConnectInfo for setting ConnectInfo during tests (#​1767)

v0.6.6: axum - v0.6.6

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• fixed: Enable passing MethodRouter to Router::fallback (#​1730)

v0.6.5: axum - v0.6.5

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• fixed: Fix #[debug_handler] sometimes giving wrong borrow related suggestions (#​1710)
• Document gotchas related to using impl IntoResponse as the return type from handler functions (#​1736)

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