Dependency updates - Githubissues

Some adjustments to keep the software running:

Remove building Lanelet2 from sources. Not needed anymore as all required PRs have been merged and the new binary was released. Removed the submodule.
Downgrade antlr4-python3-runtime==4.9.3 to fix the parsing error Could not deserialize ATN with version (expected 4)
Downgrade py-trees==0.7.6 to match version from ROS package ros-noetic-py-trees
Updated README and the script

rodrigoqueiroz / geoscenarioserver