mailman: update from 2.1.29 to version 3.2.2

pkgs/development/python-modules/flufl/lock.nix

@@ -0,0 +1,13 @@
+{ buildPythonPackage, fetchPypi, atpublic }:
+
+buildPythonPackage rec {
+  pname = "flufl.lock";
+  version = "3.2";
+
+  propagatedBuildInputs = [ atpublic ];
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0nzzd6l30ff6cwsrlrb94xzfja4wkyrqv3ydc6cz0hdbr766mmm8";
+  };
+}