Update dependencies that have critical vulnerabilities

[neilmispelaar]

Attempts to address the critical vulnerabilities that were identified by yarn audit --level critical

More information can be found here:

https://github.com/GoogleChrome/lighthouse-ci/issues/1058

This PR attempts to update the following dependencies

• jest-image-snapshot: ^6.4.0
• lerna: ^5.5.4
• mysql2: ^3.10.2
• pg-hstore: ^2.3.4

There is also a separate PR within the @patrickhulce/scripts package https://github.com/patrickhulce/hulk/pull/12 to address those outdated dependencies. It made more sense to try to address upstream as opposed to using a bunch of overrides.

Thanks for your consideration.

Happy to help with additional testing or other information. Just let me know.

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[sdavids]

https://github.com/patrickhulce/hulk/pull/12 has been merged so I think this one can be updated…

[connorjclark]

Can you please sign the CLA?