Bump axum from 0.6.17 to 0.6.18

[dependabot[bot]]

Bumps axum from 0.6.17 to 0.6.18.

Release notes

Sourced from axum's releases.

axum - v0.6.18

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

#1972: tokio-rs/axum#1972

Commits

• 79ea274 Release axum 0.6.18 (#1973)
• 9c5f4eb Don't remove the Sec-WebSocket-Key header in WebSocketUpgrade (#1972)
• See full diff in compare view

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[dependabot[bot]]

Looks like axum is up-to-date now, so this is no longer needed.