Update module github.com/knadh/koanf to v1.4.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/knadh/koanf	require	minor	v1.3.3 -> v1.4.0

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Release Notes

knadh/koanf

### [`v1.4.0`](https://togithub.com/knadh/koanf/releases/v1.4.0) [Compare Source](https://togithub.com/knadh/koanf/compare/v1.3.3...v1.4.0) #### What's Changed - feat(appconfig): add new ProviderWithClient initialiser by [@​ollystephens](https://togithub.com/ollystephens) in [https://github.com/knadh/koanf/pull/124](https://togithub.com/knadh/koanf/pull/124) - Add variadic options parameter to `Load` by [@​aeneasr](https://togithub.com/aeneasr) in [https://github.com/knadh/koanf/pull/128](https://togithub.com/knadh/koanf/pull/128) #### New Contributors - [@​ollystephens](https://togithub.com/ollystephens) made their first contribution in [https://github.com/knadh/koanf/pull/124](https://togithub.com/knadh/koanf/pull/124) **Full Changelog**: https://github.com/knadh/koanf/compare/v1.3.3...v1.4.0

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