chore: replace backoff by backon library

[ruseinov]

Summary of changes

This PR can wait till there is a new release of gossipsub, then the audit ignore can be removed.

Changes introduced in this pull request:

• Replace an unmaintained backoff library with backon.

Reference issue to close (if applicable)

Closes

Other information and links

Note that this new library does not have the elapsed time constraint, instead it has a maximum number of retries.

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.