MAINT: update cdflib standards for 0.4+

[jklenzing]

Description

Addresses #111

The version cap for cdflib was employed to avoid bugs and incompatibilities in that version, which have been since fixed. This accepts only newer versions.

The new version of cdflib avoids the issue with metadata stored in arrays. The workarounds for meta have been removed.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

import pysat
plp = pysat.Instrument('cnofs', 'plp')
plp.load(2009, 1)

Data should successfully load.

Test Configuration

• Operating system: Mac OS X 11.6.5
• Version number: Python 3.8.11
• cdflib 0.4.4

Checklist:

• [x] Make sure you are merging into the develop (not main) branch
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [x] Any dependent changes have been merged and published in downstream modules
• [x] Add a note to CHANGELOG.md, summarizing the changes
• [x] Update zenodo.json file for new code contributors