[3.12] gh-137638: Use macos-15-intel in GitHub Actions (GH-139154)

(cherry picked from commit 1ae9250)

Co-authored-by: Jacob Coffee <[email protected]>
Co-authored-by: 🇺🇦 Sviatoslav Sydorenko (Святослав Сидоренко) <[email protected]>
Co-authored-by: Hugo van Kemenade <[email protected]>

Author: 3 people

.github/workflows/build.yml

@@ -240,13 +240,13 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # Cirrus and macos-14 are M1, macos-13 is default GHA Intel.
+        # Cirrus and macos-14 are M1, macos-15-intel is default GHA Intel.
         # macOS 13 only runs tests against the GIL-enabled CPython.
         # Cirrus used for upstream, macos-14 for forks.
         os:
         - ghcr.io/cirruslabs/macos-runner:sonoma
         - macos-14
-        - macos-13
+        - macos-15-intel
         is-fork:  # only used for the exclusion trick
         - ${{ github.repository_owner != 'python' }}
         free-threading:
@@ -257,7 +257,7 @@ jobs:
           is-fork: true
         - os: macos-14
           is-fork: false
-        - os: macos-13
+        - os: macos-15-intel
           free-threading: true
     uses: ./.github/workflows/reusable-macos.yml
     with: