Update module cenkalti/backoff to v4

This MR contains the following updates:

Package	Type	Update	Change
github.com/cenkalti/backoff	require	major	v2.2.1+incompatible -> v4.1.0

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Release Notes

cenkalti/backoff

v4.1.0

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v4.0.2

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v4.0.1

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v4.0.0

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v3.2.2

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v3.2.1

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v3.2.0

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v3.1.2

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v3.1.1

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v3.1.0

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v3.0.0

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