[CI] Update sleef submodule to v3.8 (#151955)

Should help with RISC-V cross-compilation.
3.9.0 migration is blocked by sleef project switching to C++20
Pull Request resolved: https://github.com/pytorch/pytorch/pull/151955
Approved by: https://github.com/atalman, https://github.com/wdvr, https://github.com/Skylion007
This commit is contained in:
Nikita Shulga
2025-04-23 13:19:35 -07:00
committed by PyTorch MergeBot
parent fd3d339e17
commit 4d2d833976