ci: Update setup-qemu-action version

Eliminates some more deprecation warnings

Author: bdarnell

.github/workflows/build.yml

@@ -53,7 +53,7 @@ jobs:
           python-version: ${{ env.python-version }}
       - name: Set up QEMU
         if: runner.os == 'Linux'
-        uses: docker/setup-qemu-action@v1
+        uses: docker/setup-qemu-action@v2
         with:
           platforms: all