Add netCDF in the media types list

[clausmichele]

Description:

The media type for netCDF files was missing from the pystac.media_type class. It is already used in a test file here:

pystac/tests/data-files/datacube/item.json

Line 116 in c77412e

"type": "application/netcdf",

Sample public STAC Collection using this media type: https://planetarycomputer.microsoft.com/api/stac/v1/collections/nasa-nex-gddp-cmip6/items

PR Checklist:

• pre-commit hooks pass locally
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.28%. Comparing base (c77412e) to head (a5f18c6).
Report is 42 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1386   +/-   ##
=======================================
  Coverage   91.28%   91.28%           
=======================================
  Files          51       51           
  Lines        7220     7221    +1     
  Branches     1018     1018           
=======================================
+ Hits         6591     6592    +1     
  Misses        450      450           
  Partials      179      179           

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