Bump 2.9a1.post15

Linux: Fix bug in OIDN and Embree, due to multiple compiler versions in the container
Linux: Remove OIDN hack (thanks to previous fix)
Windows: Remove heif dep for OIIO (due to crash)

Author: howetuft

pyproject.toml

@@ -8,7 +8,7 @@ build-backend = "scikit_build_core.build"
 
 [project]
 name = "pyluxcore"
-version = "2.9a1.post14"
+version = "2.9a1.post15"
 dependencies = [
   "numpy >= 2; python_version > '3.8'",
   "numpy < 2; python_version <= '3.8'",