Workbench: Try to fix the ruamel.yaml.clib failure.

I think that the build failure is fixed in a newer version of the
package. Let's see if something fails to install with this constraint.

workbench/Dockerfile

@@ -174,6 +174,7 @@ ENV PIPX_BIN_DIR /opt/pipx/bin
 # hadolint ignore=DL3013
 RUN export PIP_CONSTRAINT=/tmp/constraint.txt && \
     echo 'packaging==24.0' >> "$PIP_CONSTRAINT" && \
+    echo 'ruamel.yaml.clib==0.2.8' >> "$PIP_CONSTRAINT" && \
     python3 -m pip install --no-cache-dir --break-system-packages \
         https://github.com/aws/aws-cli/archive/refs/heads/v2.zip \
         Glances \