bonsai: drop Intel macOS builds

Upstream binary builds no longer produce macos64 zips (build_osx builds
arm64 only since wgpu Qt), and Blender dropped Intel Mac support in 5.0,
so there is nothing left to package for that platform.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.github/workflows/ci-bonsai.yml

@@ -34,19 +34,10 @@ jobs:
             name: "Linux Build",
             short_name: linux,
           }
-          - {
-            name: "MacOS Build",
-            short_name: macos,
-          }
           - {
             name: "MacOS ARM Build",
             short_name: macosm1,
           }
-        exclude:
-          # Python 3.13 is needed for Blender 5.1+ and Blender dropped Intel Mac support in 5.0.
-          - pyver: py313
-            config:
-              short_name: macos
     steps:
       - uses: actions/checkout@v7
       - uses: actions/setup-python@v7 # https://github.com/actions/setup-python