fix(deps): update module github.com/giantswarm/backoff to v2

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
github.com/giantswarm/backoff	v1.0.1 → v2.0.0

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Release Notes

giantswarm/backoff (github.com/giantswarm/backoff)

v2.0.0

Compare Source

Changed

• [Breaking] Upgrade github.com/cenkalti/backoff/v4 v4.3.0 to github.com/cenkalti/backoff/v6 v6.0.1
  • On failure, Retry/RetryNotify now return a *backoff.RetryError wrapping
    the last operation error instead of returning that error directly. Use
    errors.Is/errors.As (or microerror.Cause) to match the underlying error;
    comparing the returned error with == will no longer work.
• Upgrade to Go 1.23
• Upgrade github.com/giantswarm/micrologger v1.1.1 to v1.1.2
• Upgrade github.com/go-logr/logr v1.3.0 to v1.4.2

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