Remove github.com/olebedev/config

[griggsca91]

Repo - https://github.com/olebedev/config

• [x] The project has not made an official release within the last year and has open issues. - It has been 2 years since an update to the repo
• [x] The project is not responding to bug reports issued within 6 months of submission.
  • https://github.com/olebedev/config/issues?q=is%3Aissue+is%3Aclosed last closed issue was in 2018
• [ ] The project is not meeting quality standards as indicated by the Go Report Card or Code Coverage tests.
• [ ] The quality standard links have been removed from the documentation.
• [ ] The project is no longer open-sourced.
• [ ] The project is incompatible with any Go version issued within the last year (there is hopefully an open PR about this at the project).

Related issue: https://github.com/avelino/awesome-go/issues/5136

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