Fix workflow issue

Author: mcbarton

.github/workflows/Ubuntu.yml

@@ -502,7 +502,7 @@ jobs:
     - name: Build and Install cppyy-backend
       if: ${{ matrix.cppyy == 'On' }}
       run: |
-        cd ${{ github.workspace }}/cppyy-backend
+        cd ${{ github.workspace }}
         mkdir -p $CPPINTEROP_DIR/lib build && cd build
         # Install CppInterOp
         (cd $CPPINTEROP_BUILD_DIR && cmake --build . --target install --parallel ${{ env.ncpus }} )