ppc64le ci changes

Author: sandeepgupta12

.github/workflows/ppc64le.yml

@@ -26,7 +26,7 @@ jobs:
         uses: docker/setup-buildx-action@v2
       - name: Build Docker image for ppc64le
         run: |
-          docker build -f .ci\docker\manywheel\Dockerfile_ppc64le -t pytorch-ppc64le:ubi9.3 .
+          docker build -f .ci/docker/manywheel/Dockerfile_ppc64le -t pytorch-ppc64le:ubi9.3 .
 
   ppc64le-UBI-9-3-Build-and-Test:
     name: ppc64le-UBI-9-3-Build-and-Test