Only set up QEMU for Linux aarch64, not Windows

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: dainnilsson

.github/workflows/build.yml

@@ -101,7 +101,7 @@ jobs:
       - uses: actions/checkout@v6
 
       - name: Set up QEMU
-        if: matrix.target == 'aarch64'
+        if: matrix.target == 'aarch64' && startsWith(matrix.os, 'ubuntu')
         uses: docker/setup-qemu-action@v3
         with:
           platforms: arm64