Upgrade external CGNS library to 4.4 release.

[MicK7]

Proposed Changes

The files of the external CGNS library included with SU2 are upgraded to 4.4 release.
This will allow reading files generated with recent version of CGNS that are currently rejected because SU2 included version is a bit old.

Related Work

No issue created yet but some users did comment about it.

PR Checklist

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• I am submitting my contribution to the develop branch.
• My contribution generates no new compiler warnings (try with --warnlevel=3 when using meson).
• My contribution is commented and consistent with SU2 style (https://su2code.github.io/docs_v7/Style-Guide/).
• I used the pre-commit hook to prevent dirty commits and used pre-commit run --all to format old commits.
• I have added a test case that demonstrates my contribution, if necessary.
• I have updated appropriate documentation (Tutorials, Docs Page, config_template.cpp), if necessary.