OpenImageIO v2.4.8.1

Release 2.4.8.1 (13 Feb 2023) -- compared to 2.4.8.0

• Fix(targa): guard against corrupted tga files Fixes TALOS-2023-1707 /
  CVE-2023-24473, TALOS-2023-1708 / CVE-2023-22845. #3768
• Fix: race condition in TIFF reader, fixes TALOS-2023-1709 / CVE-2023-24472.
  #3772
• Windows: Fix unresolved external symbol for MSVS 2017 #3763
• Fix: Initialize OpenEXROutput::m_levelmode in init(). #3764
• Fix: improve thread safety for concurrent tiff loads. #3767
• Fix(fits): Make sure to close if open fails to find right magic number.
  #3771