b6674

ci : change macos-13 to macos-15-intel

This commit updates the macos-13 runners to macos-15-intel.

The motivation for this changes is the macos-13 runners are scheduled
to be retired on 2025-12-04.

Refs: https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down/

b6440

ci : add caching for ROCm installation in release workflow

This commit applies the same caching to the release workflow which
currently exists for the main CI workflow that was introduced in Commit
ff02caf9eed261423289d1531a56536fbf57bfc2 ("ci : cache ROCm installation
in windows-latest-cmake-hip (#15887)").

b6152

HIP: bump requirement to rocm 6.1 (#15296)

b6144

ggml : repack block_iq4_nlx8 (#14904)

ggml-ci