Switch CI from macOS-13 to macOS-15-intel runners

Co-authored-by: hombit <1784493+hombit@users.noreply.github.com>

Author: Copilot

.github/workflows/publish.yml

@@ -40,11 +40,11 @@ jobs:
         # We use the same order as in the table
         # * For Windows we support amd64 only
         # * For Linux we support ARM64 and x86_64
-        # * For macOS we support x86_64 (macos-13 runner) and ARM64 (macos-14 runner)
+        # * For macOS we support x86_64 (macos-15-intel runner) and ARM64 (macos-14 runner)
         # * We build wheels for CPython only, one per platform, compatible with ABI3.9
         include:
           # CPython 3.9
-          - os: macos-13
+          - os: macos-15-intel
             cibw_build: cp39-macosx_x86_64
           - os: macos-14
             cibw_build: cp39-macosx_arm64