Upgrade Axum to 0.7

[Phoenix500526]

Sooner or later we should upgrade it. I would create this ticket to collect information since this upgrade is a huge breaking change from axum side - https://github.com/tokio-rs/axum/releases/tag/axum-v0.7.0

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[Phoenix500526]

Blocked by tonic use http 0.2 and axum 0.6 Ref - https://github.com/hyperium/tonic/pull/1670

[Phoenix500526]

Other PRs:

• https://github.com/hyperium/tonic/pull/1670
• https://github.com/etcdv3/etcd-client/pull/75

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