OpenImageIO v2.3.21.0

Release 2.3.21 (1 Nov 2022) -- compared to 2.3.20

• oiiotool: protect against OpenEXR thread deadlock on Windows. #3582
• oiiotool: work around static destruction order issue. #3591
• Fix PSD import on ARM. #3589
• Docs: write Windows build instructions in INSTALL.md. #3602
• RLA: fix potential buffer overrun. (TALOS-2022-1629, CVE-2022-36354) #3624
• TIFF: guard against corrupt files with buffer overflows. (TALOS-2022-1627,
  CVE-2022-41977) #3628
• TIFF: guard against buffer overflow for certain CMYK files.
  (TALOS-2022-1633, CVE-2022-41639) (TALOS-2022-1643, CVE-2022-41988) #3632