Updating Requirements

Relaxing the version requirements to address issue #266

Description

Version 4.2.0 enforced strict equality on dependencies using ==. This PR restores the dependencies to their earlier versions and relaxes the requirements using >= in the requirements and setup.

Related Issue

Please link to the issue here: #266

Motivation and Context

Relaxing the version requirements should make UQpy more compatible with different packages and environments.

Types of changes

What types of changes does your code introduce? Put an x in all the boxes that apply:

• 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 change)

Checklist:

Go over all the following points, and put an x in all the boxes that apply.
If you're unsure about any of these, don't hesitate to ask. We're here to help!

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.