fix(deps): update rust crate axum to 0.6.18

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
axum	dependencies	patch	0.6.12 -> 0.6.18

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Release Notes

tokio-rs/axum

v0.6.18: axum - v0.6.18

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• fixed: Don't remove the Sec-WebSocket-Key header in WebSocketUpgrade (#​1972)

v0.6.17: axum - v0.6.17

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• fixed: Fix fallbacks causing a panic on CONNECT requests (#​1958)

v0.6.16: axum - v0.6.16

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• fixed: Don't allow extracting MatchedPath in fallbacks (#​1934)
• fixed: Fix panic if Router with something nested at / was used as a fallback (#​1934)
• added: Document that Router::new().fallback(...) isn't optimal (#​1940)

v0.6.15: axum - v0.6.15

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• fixed: Removed additional leftover debug messages (#​1927)

v0.6.14: axum - v0.6.14

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• fixed: Removed leftover "path_router hit" debug message (#​1925)

v0.6.13: axum - v0.6.13

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• added: Log rejections from built-in extractors with the
  axum::rejection=trace target (#​1890)
• fixed: Fixed performance regression with Router::nest introduced in
  0.6.0. nest now flattens the routes which performs better (#​1711)
• fixed: Extracting MatchedPath in nested handlers now gives the full
  matched path, including the nested path (#​1711)
• added: Implement Deref and DerefMut for built-in extractors (#​1922)

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