chore(deps): update dependency @wdio/spec-reporter to v6.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@wdio/spec-reporter	devDependencies	patch	6.6.6 -> 6.6.8

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Release Notes

webdriverio/webdriverio

### [`v6.6.8`](https://togithub.com/webdriverio/webdriverio/blob/master/CHANGELOG.md#v668-2020-10-20) [Compare Source](https://togithub.com/webdriverio/webdriverio/compare/v6.6.6...v6.6.8) ##### :rocket: New Feature - `wdio-spec-reporter` - [#​6005](https://togithub.com/webdriverio/webdriverio/pull/6005) Spec Reporter - custom symbols for report ([@​unickq](https://togithub.com/unickq)) ##### :house: Internal - [#​6013](https://togithub.com/webdriverio/webdriverio/pull/6013) Changed workflow setup for docs ([@​erwinheitzman](https://togithub.com/erwinheitzman)) ##### Committers: 2 - Erwin Heitzman ([@​erwinheitzman](https://togithub.com/erwinheitzman)) - Nick ([@​unickq](https://togithub.com/unickq))

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