Bump fett to use wheel

Author: i80and

pyproject.toml

@@ -18,7 +18,7 @@ requires = [
     "pyyaml ~= 5.3",
     "typing-extensions >= 3.7",
     "python-jsonrpc-server ~= 0.3.4",
-    "fett ~= 0.3.2",
+    "fett ~= 0.4.0",
     "networkx >= 2.4, < 3",
     "docopt ~= 0.6.2"
 ]