[mlir] [flang] [llvm] [clang] [AMDGPU] Change default AMDHSA Code Object version to 5 (PR #79038)

[Saiyedul Islam via cfe-commits]

saiislam wrote:

> Should get a mention in the release notes

Thanks for pointing it out. I have updated it.

https://github.com/llvm/llvm-project/pull/79038