[ci] Updated package sources for notebook ci

.github/workflows/notebook-test-ci.yml

@@ -53,6 +53,7 @@ jobs:
           pip3 install --upgrade pip --root-user-action=ignore
           cd /opt/ros/overlay_ws/src/pycram
           pip3 install -r requirements.txt
+          sudo apt-get update
           sudo apt-get install -y libpq-dev
           pip3 install -r requirements-resolver.txt
 
@@ -80,4 +81,4 @@ jobs:
         run: |
           source /opt/ros/overlay_ws/devel/setup.bash 
           roscd pycram/examples/tmp
-          treon --thread 1 -v --exclude=migrate_neems.ipynb --exclude=improving_actions.ipynb
+          treon --thread 1 -v --exclude=migrate_neems.ipynb --exclude=improving_actions.ipynb