Fix pyopencl version

ci/dockerfiles/ubuntu_jammy/Dockerfile

@@ -251,6 +251,7 @@ COPY --from=main-stage $HYSOP_HOME/hysopenv $HYSOP_HOME/hysopenv
 ENV VIRTUAL_ENV=$HYSOP_HOME/hysopenv
 ENV PATH="$VIRTUAL_ENV/bin:$PATH"
 RUN pip install --no-cache-dir setuptools==68.2.2 numpy==1.22.3 # just to be sure ...
+RUN pip install --no-cache-dir pocl-binary-distribution
 WORKDIR $HYSOP_HOME
 
 RUN rm -rf $HOME/.cache/pip/*

ci/requirements_full.txt

@@ -40,4 +40,5 @@ sphinx_bootstrap_theme
 sphinx-rtd-theme
 strip-hints
 ansicolors
-pyopencl
+pyopencl==2023.1.2
+