util/docker/: Drop recommonmark pip module

The documentation is now built using MyST Parser, so Recommonmark can be
dropped.

Change-Id: I7f6810c9429573c0c51d3d72b36e9fc2ae2185f5
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/80313
Reviewed-by: Martin L Roth <gaumless@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/docker/coreboot-jenkins-node/Dockerfile

@@ -78,7 +78,6 @@ RUN echo 'export PATH=$PATH:/opt/xgcc/bin' >> /home/coreboot/.bashrc && \
 	pip3 install --no-cache-dir \
 		setuptools==58.2.0 \
 		jinja2==3.1.3 \
-		recommonmark===0.7.1 \
 		myst-parser===2.0.0 \
 		sphinx===7.2.6 \
 		sphinxcontrib-ditaa===1.0.2 \

util/docker/doc.coreboot.org/Dockerfile

@@ -14,7 +14,6 @@ RUN python3 -m venv $VIRTUAL_ENV && \
  pip3 install --upgrade --no-cache-dir pip && \
  pip3 install --no-cache-dir \
   jinja2==3.1.3 \
-  recommonmark===0.7.1 \
   myst-parser==2.0.0 \
   sphinx===7.2.6 \
   sphinxcontrib-ditaa===1.0.2 \