fix dockerfile

Author: anthony-nhs

docker/Dockerfile

@@ -47,11 +47,6 @@ RUN asdf plugin add nodejs https://github.com/asdf-vm/asdf-nodejs.git
 # install some common node versions that are used in builds to speed things up
 RUN asdf install nodejs 20.19.1; \
     asdf install nodejs 23.9.0
-# update npm
-RUN export ASDF_DIR=/home/cdkuser/.asdf && \
-    . /home/cdkuser/.asdf/asdf.sh && \
-    asdf shell nodejs 20.19.1 && \
-    cd ~/.asdf/installs/nodejs/20.19.1/lib && npm update npm
 
 # copy files needed for deployment
 COPY --chown=cdkuser docker/entrypoint.sh /home/cdkuser/