Fixes an issue where WP-Cypress could not find cypress/package.json

[PaulREnglish]

Description

In createConfig.js, WP-Cypress could not find the cypress/package.json since the path was a relative one. This PR fixes it by turning it into an absolute path which means that the cypress version can be properly extracted.

Change Log

• Fixed an issue where WP-Cypress could not find cypress/package.json which means that it wasn't getting the cypress version.

Types of changes (if applicable):

• Bug fix (non-breaking change which fixes an issue).
• New feature (non-breaking change which adds functionality).
• Breaking change (fix or feature that would cause existing functionality to not work as expected).

Checklist (if applicable):

• Meets provided linting standards.

[ampersarnie]

Working as expected for me. 🙌