Upgrade dev dependencies and fix tests to support pytest-asyncio strict mode

tests/controller/gns3vm/test_virtualbox_gns3_vm.py

@@ -16,6 +16,7 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import pytest
+import pytest_asyncio
 
 from tests.utils import asyncio_patch
 from gns3server.utils.asyncio import wait_run_in_executor
@@ -23,8 +24,7 @@ from gns3server.utils.asyncio import wait_run_in_executor
 from gns3server.controller.gns3vm.virtualbox_gns3_vm import VirtualBoxGNS3VM
 
 
-@pytest.fixture
-@pytest.mark.asyncio
+@pytest_asyncio.fixture
 async def gns3vm(controller):
 
     vm = VirtualBoxGNS3VM(controller)

tests/controller/gns3vm/test_vmware_gns3_vm.py

@@ -16,12 +16,12 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import pytest
+import pytest_asyncio
 
 from gns3server.controller.gns3vm.vmware_gns3_vm import VMwareGNS3VM
 
 
-@pytest.fixture
-@pytest.mark.asyncio
+@pytest_asyncio.fixture
 async def gns3vm(controller):
 
     vm = VMwareGNS3VM(controller)