⬆️ Update axum requirement from 0.6 to 0.7

[dependabot[bot]]

Updates the requirements on axum to permit the latest version.

Release notes

Sourced from axum's releases.

axum - v0.6.20

• added: WebSocketUpgrade::write_buffer_size and WebSocketUpgrade::max_write_buffer_size
• changed: Deprecate WebSocketUpgrade::max_send_queue
• change: Update tokio-tungstenite to 0.20
• added: Implement Handler for T: IntoResponse (#2140)

#2140: tokio-rs/axum#2140

Commits

• 3b92cd7 Release axum and axum-extra (#2145)
• 68333b2 Backport changes from main to v0.6.x (#2141)
• a25ed29 axum-extra 0.7.6 (#2139)
• 990cbb8 Update tokio-tungstenite 0.20 (#2123)
• a291631 axum-extra: Remove unused tower-http dependency (#2135)
• 67f6494 Release axum 0.6.19 (#2102)
• 2d4bd9e Update to latest sqlx in example (#2099)
• e881bf0 Update UI tests
• 5d9f41e Fix deny.toml
• 19ddc12 Remove sessions example
• Additional commits viewable in compare view

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