Update all usages of faker's randomDigit to randomNumber

[smithandre]

Updating all usages of faker's randomDigit to randomNumber

Description

Changed all usages of Faker's randomDigit to randomNumber

Motivation and Context

A stab at solving dbudwin#94

How Has This Been Tested?

I executed PHPuni tests locally

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• [ X ] Enhancement (non-breaking change which is not noticeable to end users)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x ] My code follows the code style of this project.
• My change requires an update to the README and I have updated it accordingly.
• [ x ] I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• [ x ] This is a complete change and doesn't leave the project in a bad state.
• [ x ] All new and existing tests passed.