Update UnityFileSystemApi to 6000.2.6f1 (#33)

Commit a new build of UnifyFileSystemApi to incorporate a fix. The new version continues to support reading files built by previous supported versions of Unity. This replaces the last snapshot which is from 2022.

Update includes a fix to remove this verbose warning that could appear when processing LZMA compressed AssetBundles: "Decompressed buffer must have new data"

I am using the version of the file from the official 6000.2.6f1 release:

OSX version was extracted (using 7-zip) from Unity-6000.2.6f1.pkg\Unity.pkg.tmp\Payload\Payload~.\Unity\Unity.app\Contents\Tools\

Linux version was extract (using 7-zip) from Unity-6000.2.6f1.tar.xz\Unity-6000.2.6f1.tar\Editor\Data\Tools\

Windows was extracted by installed in UnitySetup64-6000.2.6f1.exe and copying file from C:\Program Files\Unity 6000.2.6f1\Editor\Data\Tools

Author: SkowronskiAndrew