chore(deps): update dependency mongodb-memory-server to v6.6.8

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
mongodb-memory-server	devDependencies	patch	6.6.7 -> 6.6.8

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Release Notes

nodkz/mongodb-memory-server

### [`v6.6.8`](https://togithub.com/nodkz/mongodb-memory-server/blob/master/CHANGELOG.md#​668-httpsgithubcomnodkzmongodb-memory-servercomparev667v668-2020-09-08) [Compare Source](https://togithub.com/nodkz/mongodb-memory-server/compare/v6.6.7...v6.6.8) ##### Bug Fixes - **package:** move non-exposed [@​types](https://togithub.com/types) to devDependencies ([6ff2e8e](https://togithub.com/nodkz/mongodb-memory-server/commit/6ff2e8e57d59203d2400339a27398f0eb2ed169a)), closes [#​286](https://togithub.com/nodkz/mongodb-memory-server/issues/286)

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[coveralls]

Pull Request Test Coverage Report for Build 1351

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 94.531%

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Totals
Change from base Build 1345:	0.0%
Covered Lines:	89
Relevant Lines:	93

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💛 - Coveralls