github: Remove Intel Mac support

They're very close to end of life and we're having macOS runner
availability problems.

.github/workflows/python.yml

@@ -110,35 +110,6 @@ jobs:
           name: wheels-linux
           path: bindings/python/dist
 
-  macos-x86_64:
-    runs-on: macos-13
-    defaults:
-      run:
-        working-directory: ${{ env.working-directory }}
-    strategy:
-      matrix:
-        target: [x86_64]
-    steps:
-      - uses: actions/checkout@v3
-      - uses: actions/setup-python@v4
-        with:
-          python-version: '3.10'
-      - name: Build wheels
-        uses: PyO3/maturin-action@v1
-        env:
-          CXX: clang++
-          CC: clang
-        with:
-          working-directory: ${{ env.working-directory }}
-          target: ${{ matrix.target }}
-          args: --release --out dist --find-interpreter
-          sccache: 'true'
-      - name: Upload wheels
-        uses: actions/upload-artifact@v4
-        with:
-          name: wheels-macos-x86
-          path: bindings/python/dist
-
   macos-arm64:
     runs-on: macos-14
     defaults:
@@ -191,7 +162,7 @@ jobs:
     name: Release
     runs-on: blacksmith-4vcpu-ubuntu-2404
     if: "startsWith(github.ref, 'refs/tags/')"
-    needs: [linux, macos-arm64, macos-x86_64, sdist]
+    needs: [linux, macos-arm64, sdist]
     steps:
       - uses: actions/download-artifact@v4
         with: