Update Rust crate tower to v0.5.3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tower	dev-dependencies	patch	0.5.0 → 0.5.3

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Release Notes

tower-rs/tower (tower)

v0.5.3: tower 0.5.3

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Added

• builder: Add ServiceBuilder::boxed_clone_sync() helper (#​804)

Fixed

• retry: Check that supplied jitter is not NaN (#​843)

v0.5.2: tower 0.5.2

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Added

• util: Add BoxCloneSyncService which is a Clone + Send + Sync boxed Service (#​777)
• util: Add BoxCloneSyncServiceLayer which is a Clone + Send + Sync boxed Layer (#​802)

v0.5.1: tower 0.5.1

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• Fix minimum version of tower-layer dependency (#​787)

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