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I'll just quote from the rules: 

"You may use pre-made, publicly available, and purchased assets, as well as GDevelop's built-in asset library, or other assets you have the legal rights to use. Just remember to credit properly. " 

"You can use pre-existing code, extensions, functions. But do not write code specifically for this jam, ahead of time." 

If it's publicly available and not copyrighted you should be fine.