Update armnn to version 21.05 / rev 17 via SR 906631
    
    https://build.opensuse.org/request/show/906631
    by user Guillaume_G + dimstar_suse
    - Add '-Wno-error=stringop-overread' to workaround build error
      with GCC11 with openCL enabled
    - Add '-Wno-error=uninitialized -Wno-error=array-bounds' to
      workaround build issues with GCC11 - https://github.com/ARM-software/armnn/issues/548
    - Fix libarmnnOnnxParser version