Workbench: Remove the publish PDM plugin.

It's broken on PDM v2.

workbench/Dockerfile

@@ -226,7 +226,7 @@ RUN apt-get update && \
         transmission-rpc \
         ziglang \
     && \
-    echo pdm-publish pdm-version | xargs -n1 pdm plugin add && \
+    echo pdm-version | xargs -n1 pdm plugin add && \
     npm install --global \
         corepack \
         @playwright/test \