Workbench: Remove the legacy Pip resolver.

It's failing in https://git.shore.co.il/shore/dockerfiles/-/jobs/15817.
Let's try to new one.

workbench/Dockerfile

@@ -158,7 +158,7 @@ RUN apt-get update && \
     locale-gen && \
     export PIP_CONSTRAINT=/tmp/constraint.txt && \
     echo 'resolvelib==0.5.4' > "$PIP_CONSTRAINT" && \
-    python3 -m pip install --use-deprecated=legacy-resolver --no-cache-dir --break-system-packages \
+    python3 -m pip install --no-cache-dir --break-system-packages \
         https://github.com/aws/aws-cli/archive/refs/heads/v2.zip \
         Glances \
         PyGObject \