use native linux arm64 runner for aarch64 wheels

Author: jswhit2

.github/workflows/cibuildwheel.yml

@@ -57,6 +57,8 @@ jobs:
             arch: x86_64
           - os: ubuntu-22.04
             arch: aarch64
+          - os: ubuntu-22.04-arm
+            arch: aarch64
           - os: macos-14
             arch: arm64
           - os: macos-13
@@ -69,10 +71,11 @@ jobs:
 
     # For aarch64 support
     # https://cibuildwheel.pypa.io/en/stable/faq/#emulation
-    - uses: docker/setup-qemu-action@v3
-      with:
-        platforms: all
-      if: runner.os == 'Linux' && matrix.arch == 'aarch64'
+    # (no longer needed since there is a native linux arm64 runner now)
+    #- uses: docker/setup-qemu-action@v3
+    #  with:
+    #    platforms: all
+    #  if: runner.os == 'Linux' && matrix.arch == 'aarch64'
 
     - name: Build oldest and newest Python
       shell: bash