chore(deps): update skynetlabs/skyd docker tag to v1.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
skynetlabs/skyd	patch	1.6.7 -> 1.6.8

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Release Notes

SkynetLabs/docker-skyd

### [`v1.6.8`](https://togithub.com/SkynetLabs/docker-skyd/compare/v1.6.7...v1.6.8) [Compare Source](https://togithub.com/SkynetLabs/docker-skyd/compare/v1.6.7...v1.6.8)

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