Pact Foundation

<https://github.com/pact-foundation/pact-js-core/pull/436|#436 Update deps>
Pull request opened by <https://github.com/TimothyJones|TimothyJones>
This PR fixes deprecation and npm audit warnings on a clean developer install.

No user-facing changes.
<https://github.com/pact-foundation/pact-js-core|pact-foundation/pact-js-core>
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<https://github.com/pact-foundation/pact-js-core/pull/436|#436 Update deps>
Pull request merged by <https://github.com/mefellows|mefellows>
<https://github.com/pact-foundation/pact-js-core|pact-foundation/pact-js-core>