Update to SDK v1.39.0 and Unity 6#5

pzhine wants to merge 2 commits intoSpectacularAI:mainSpectacularAI/unity-wrapper:mainfrom

fubilab:chore/sdk-1.39.0-and-unity-6fubilab/sai-unity:chore/sdk-1.39.0-and-unity-6Copy head branch name to clipboard