chore(ci): migrate from macos-13 to macos-15-intel runner

GitHub announced the deprecation of the `macos-13` runner image[^1],
which will be completely removed by December 4th, 2025.

This commit migrates all workflows to use `macos-15-intel` runners
following the announcement's recommendation.

This also uses `ubuntu-latest` alias instead of explicit `ubuntu-24.04`.

[^1]: https://github.blog/changelog/2025-09-19-github-actions-macos-13-runner-image-is-closing-down/

Signed-off-by: Aofei Sheng <aofei@aofeisheng.com>

.github/workflows/release-build.yml

@@ -153,7 +153,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - os: macos-13
+          - os: macos-15-intel
             goos: darwin
             goarch: amd64
             go-version: "1.24.2"