Update gdal export

[JRM]

Hi, with GDAL 3.2 it is now possible to benefit from
- multithreading when doing an tiff export with a JPEG compression
- multithreading when computing the overviews
- faster deflate compression/decompression through libdeflate

these features would speed up the export of orthomosaïcs

regards,
JR

[Alexey Pasumansky]

Hello JRM,

Metashape is not using GDAL libraries for export.

But do you see any problems with the current orthomosaic export, like long operation time and etc?