Bump external/OpenCL-Headers from `5e3df1c` to `8275634`

[dependabot[bot]]

Bumps external/OpenCL-Headers from 5e3df1c to 8275634.

Commits

• 8275634 update extension headers with latest extensions (#249)
• 5945253 Fix CMake deprecation warning (#246)
• f8f40ff cl_mutable_dispatch_asserts_khr definitions (#243)
• 2368105 updates extension headers for the latest XML file (#244)
• 8de09e8 updates extension headers for the latest XML file (#240)
• 9ce9a72 Update extension headers for latest cl.xml changes (#242)
• 1ebe961 add compatibility notes (#238)
• cea6342 fix VME skip block type enum to match spec (#241)
• 10aaadf fix the OpenCL version for the CL_DEPTH enum (#231)
• 489ba7a require C99 for header tests (#208)
• Additional commits viewable in compare view

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