[3.12] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) (GH-146412) (GH-146414) (#146635)

Co-authored-by: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Co-authored-by: clintonsteiner <47841949+clintonsteiner@users.noreply.github.com>

Author: 3 people

.github/workflows/build.yml

@@ -240,16 +240,16 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        # macos-14 is M1, macos-15-intel is Intel.
-        # macos-15-intel only runs tests against the GIL-enabled CPython.
+        # macos-26 is Apple Silicon, macos-26-intel is Intel.
+        # macos-26-intel only runs tests against the GIL-enabled CPython.
         os:
-        - macos-14
-        - macos-15-intel
+        - macos-26
+        - macos-26-intel
         free-threading:
         - false
         # - true
         exclude:
-        - os: macos-15-intel
+        - os: macos-26-intel
           free-threading: true
     uses: ./.github/workflows/reusable-macos.yml
     with: