Upgrade mock-fs to resolve ENXIO file errors on mocked files

[andrealit]

Description:

Upgrade mock-fs from version 4.13.0 to 5.0.0, this fixes test case ENXIO and related FS errors (related to tschaub/mock-fs#215).

This PR signifies the following version changes:

• MAJOR version increase
• MINOR version increase
• PATCH version increase

Changes:

This PR makes the following changes:

• Changed version of mock-fs package from 4.13.0 to 5.0.0

Checklist:

Before submitting this PR, I have verified that my code:

• Resides on a fix/ or feature/ branch that was initially branched off from development.
• Passes code linting (yarn lint) and unit testing (yarn test).
• Successfully builds a distribution package (yarn package).

Additionally, I have verified that:

• My name is listed in the Contributors section, or this PR includes a request to add my name.
• I have read and am aware of the CONTRIBUTING guide for this project.