Update @sinonjs/samsam to v3.3.0 for symbol property support

[mantoni]

Purpose (TL;DR) - mandatory

This updates samsam to v3.3.0 to add symbol property support and fixes the related test cases.

How to verify - mandatory

1. Check out this branch
2. npm install
3. npm t

Checklist for author

• npm run lint passes
• References to standard library functions are cached.

[coveralls]

Pull Request Test Coverage Report for Build 313

• 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 100.0%

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Totals
Change from base Build 310:	0.0%
Covered Lines:	659
Relevant Lines:	659

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💛 - Coveralls

[mroderick]

Cut a new minor version?

[mantoni]

It's implicitly coming with a fresh install for users, so no need for a release really. Other than that I wanted to release 4.0.0 with the removed defined API and failing when equals is given undefined (#87).