Fix pytorch jni publish pipeline (#1058)

Change-Id: Iec9dc9d2808c22bd8b18b87777f12162bfe454da

Author: frankfliu

.github/workflows/native_jni_s3_pytorch.yml

@@ -172,6 +172,7 @@ jobs:
           aws-secret-access-key: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
           aws-region: us-east-2
       - name: Copy files to S3 with the AWS CLI
+        shell: bash
         run: |
           PYTORCH_VERSION="$(cat gradle.properties | awk -F '=' '/pytorch_version/ {print $2}')"
           aws s3 sync pytorch/pytorch-native/jnilib s3://djl-ai/publish/pytorch-${PYTORCH_VERSION}/jnilib