Bump @pact-foundation/pact from 9.11.1 to 9.15.2

Bumps [@pact-foundation/pact](https://github.com/pact-foundation/pact-js) from 9.11.1 to 9.15.2.
- [Release notes](https://github.com/pact-foundation/pact-js/releases)
- [Changelog](https://github.com/pact-foundation/pact-js/blob/master/CHANGELOG.md)
- [Commits](pact-foundation/pact-js@v9.11.1...v9.15.2)

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Author: dependabot[bot]