OpenImageIO v3.0.8.0

Release 3.0.8.0 (Jul 1, 2025) -- compared to 3.0.7.0

• oiiotool: New expression pseudo-metadata term: SUBIMAGES #4804
• oiiotool: Fixes to --missingfile behavior #4803
• iv: Area probe #4767 (by Danielle Imogu)
• python: Python ImageBuf.init_spec did not return correct value #4805
• fix: ImageOutput::check_open logic was flawed #4779
• int(iv): Add raw string syntax modifier for VSCode and Cursor to understand its glsl #4796 (by Aleksandr Motsjonov)
• int(iv): Use R"()" syntax for glsl shader strings for better readability #4795 (by Aleksandr Motsjonov)
• exr: Not honoring 'missingcolor' for scanline files #4757
• build: Add arm_neon.h include on Windows ARM64 with clang-cl #4691 (by Anthony Roberts)
• build: Adjust pystring finding #4816
• build(jxl): Use correct cmake variables for the include directories #4810 #4813 (by Jesse Yurkovich)
• tests: Remove old test reference output we no longer need #4817
• ci: Remove tests on Windows-2019 GitHub runner #4793
• ci: Various ccache save/restore improvements for CI runs #4797
• ci: Simplify gh-win-installdeps, no more vcpkg #4809
• admin: Remove stale intake documents #4815