devel/opencl: Update 3.0.19 -> 3.1.1

Changelog:

• Add support for OCL_ICD_FILENAMES.
• Loader deinitialization/
• Updated for OpenCL 3.1.1.

https://github.com/KhronosGroup/OpenCL-Headers/releases/tag/v2026.05.29

Commit log:
https://github.com/KhronosGroup/OpenCL-Headers/compare/v2025.07.22...v2026.05.29

PR: 298028
Sponsored by: UNIS Labs