Update module github.com/deepch/vdk to v0.0.21

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/deepch/vdk	require	patch	v0.0.20 -> v0.0.21

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Release Notes

deepch/vdk (github.com/deepch/vdk)

### [`v0.0.21`](https://togithub.com/deepch/vdk/releases/tag/v0.0.21): test [Compare Source](https://togithub.com/deepch/vdk/compare/v0.0.20...v0.0.21)

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Configuration

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