Update sandbox workflow to replace 'yarn multiple-pxe' with 'yarn multiple-wallet' for improved script execution.

Author: critesjosh

.github/workflows/sandbox.yaml

@@ -138,6 +138,6 @@ jobs:
       - name: Run sandbox scripts
         run: |
           script -e -c "yarn fees"
-          script -e -c "yarn multiple-pxe"
+          script -e -c "yarn multiple-wallet"
           script -e -c "yarn profile"
           script -e -c "yarn interaction-existing-contract"