Merge branch '2.2' into 3.0

# Conflicts:
#	.github/workflows/testing.yml
#	CHANGELOG
#	README.md
#	dev-requirements.txt
#	gns3server/compute/docker/docker_vm.py
#	gns3server/controller/export_project.py
#	gns3server/controller/import_project.py
#	gns3server/controller/project.py
#	gns3server/crash_report.py
#	gns3server/static/web-ui/index.html
#	gns3server/static/web-ui/main.df8c319a3da6fb0e3629.js
#	gns3server/version.py
#	requirements.txt
#	setup.py
#	tests/compute/docker/test_docker_vm.py
#	tests/controller/test_import_project.py

gns3server/compute/base_node.py

@@ -742,6 +742,7 @@ class BaseNode:
         path = shutil.which(self._manager.config.settings.Server.ubridge_path)
         return path
 
+    @locking
     async def _ubridge_send(self, command):
         """
         Sends a command to uBridge hypervisor.