fix(deps): update dependency serialize-javascript to v1.9.1 - abandoned

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
serialize-javascript	1.7.0 -> 1.9.1

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Release Notes

yahoo/serialize-javascript

v1.9.1

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• Revert #​54 for breaking changes (see: https://github.com/yahoo/serialize-javascript/issues/57)
• Bump mocha from 5.2.0 to 6.2.0 (#​56)

v1.9.0

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• support serialize undefined (@​nqdy666, #​54)
• Update Node.js versions to tests

v1.8.0

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• Enhanced object literals don't have arrows (@​jowenjowen, #​51)

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