fix(deps): update rust crate tower to 0.5

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
tower	dependencies	minor	0.4 -> 0.5

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Release Notes

tower-rs/tower (tower)

v0.5.0: tower 0.5.0

Compare Source

Fixed

• util: BoxService is now Sync (#​702)

Changed

• util: Removed deprecated ServiceExt::ready_and method and ReadyAnd
  future (#​652)
• retry: Breaking Change retry::Policy::retry now accepts &mut Req and &mut Res instead of the previous mutable versions. This
  increases the flexibility of the retry policy. To update, update your method signature to include mut for both parameters. (#​584)
• retry: Breaking Change Change Policy to accept &mut self (#​681)
• retry: Add generic backoff utilities (#​685)
• retry: Add Budget trait. This allows end-users to implement their own budget and bucket implementations. (#​703)
• reconnect: Breaking Change Remove unused generic parameter from Reconnect::new (#​755)
• ready-cache: Allow iteration over ready services (#​700)
• discover: Implement Clone for Change (#​701)
• util: Add a BoxCloneServiceLayer (#​708)
• rng: use a simpler random 2-sampler (#​716)
• filter: Derive Clone for AsyncFilterLayer (#​731)
• general: Update IndexMap (#​741)
• MSRV: Increase MSRV to 1.63.0 (#​741)

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[Kobzol]

This currently introduces an additional tower version, the rest of the codebase uses 0.4.

[renovate]

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