corrected httomolibgpu version

Author: dkazanc

.github/workflows/httomo_backends_pypi_publish.yml

@@ -30,7 +30,7 @@ jobs:
           $CONDA/bin/pip install setuptools wheel
           $CONDA/bin/pip install build          
           $CONDA/bin/pip install httomolib==2.1
-          $CONDA/bin/pip install --no-deps httomolibgpu==2.1
+          $CONDA/bin/pip install --no-deps httomolibgpu==2.1.1
           $CONDA/bin/conda list
       - name: Generate yaml templates
         run: |