MAINT: upgrade netcdf4 requirement

[Gui-FernandesBR]

Pull request type

Please check the type of change your PR introduces:

• Other (please describe): requirements update

Pull request checklist

Please check if your PR fulfills the following requirements, depending on the type of PR:

• Code base maintenance (refactoring, formatting, renaming):

  • Docs have been reviewed and added / updated if needed
  • Lint (black rocketpy) has passed locally and any fixes were made
  • All tests (pytest --runslow) have passed locally

What is the current behavior?

The requirements for netcdf4 dependency is a bit more complex than what would be ideal. This has been a problem since the BUG #205 was reported.

What is the new behavior?

Everything is easier with the newest version of netcdf4, which may work without error all environments, including google colab.

Does this introduce a breaking change?

• No

Other information

• It is sad that this PR isn't going to the master branch directly, but let's be patient and wait until the v1 gets finally merged into master
• This PR should wait for the MAINT: Dropping support for python 3.7 #365 to be merged into beta/v1.0.0
• This should finally fix the BUG mentioned above (RuntimeError: Unable to load latest weather data for GFS #205 )

[MateusStano]

Just one change here, everything else seems good

[Gui-FernandesBR]

Going to merge this one into maint/drop-py37, ad from there we merge into beta/v1.
I think that's a faster way