refactor: use f-strings in compute tests

tests/compute/vpcs/test_vpcs_manager.py

@@ -74,5 +74,5 @@ async def test_get_mac_id_no_id_available(compute_project, port_manager):
     with pytest.raises(VPCSError):
         for i in range(0, 256):
             node_id = str(uuid.uuid4())
-            await vpcs.create_node("PC {}".format(i), compute_project.id, node_id)
+            await vpcs.create_node(f"PC {i}", compute_project.id, node_id)
             assert vpcs.get_mac_id(node_id) == i

tests/compute/vpcs/test_vpcs_vm.py

@@ -298,7 +298,7 @@ def test_update_startup_script_with_escaping_characters_in_name(vm):
 
     vm.startup_script = "set pcname initial-name\n"
     vm.name = "test\\"
-    assert vm.startup_script == "set pcname test{}".format(os.linesep)
+    assert vm.startup_script == f"set pcname test{os.linesep}"
 
 
 def test_get_startup_script(vm):