chore(deps): Update tower to v0.5

[Serendo]

• Adjustments of Buffer type definition in Tower 0.5
• As policy is directly modified in Tower 0.5. Removed the policy part in the RetryPolicyFuture.
• The change args to mutable for the retry function and clone_request function. It's changed in Tower 0.5.
• Changed the RetryPolicyFuture Output to (). This is also changed in Tower 0.5.
• Modified some tests as policy is now modified in advance function;

Summary

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Notes

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References

#22431

[pront]

Found a couple of bugs otherwise LGTM

[pront]

Suggested change

	self.remaining_attempts -= 1;
	self.remaining_attempts = self.remaining_attempts.saturating_sub(1);

[pront]

Suggested change

	let next_duration: Duration = cmp::min(
	self.previous_duration + self.current_duration,
	self.max_duration,
	);
	let sum = self.previous_duration.checked_add(self.current_duration)
	.unwrap_or(Duration::MAX);
	let next_duration = cmp::min(sum, self.max_duration);

Example:

previous_duration = 30s
current_duration = 40s
max_duration = 60s
next_duration = 60s