chore(deps): bump github.com/knadh/koanf to v2.0.1

[kralicky]

Part of ory/x#693

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• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
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  vulnerability. If this pull request addresses a security vulnerability, I
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• I have added tests that prove my fix is effective or that my feature
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