Update software.cfg: This version of cryptography does have a setup.py file,...

Update software.cfg: This version of cryptography does have a setup.py file, but we need setuptools-rust (they advise to update pip, which I will try next if this here fails)

slapos/software/opcua-to-http-gw/software.cfg

@@ -21,6 +21,7 @@ part = python3
 recipe = zc.recipe.egg:scripts
 interpreter = py
 eggs =
+  setuptools-rust
   requests
   asyncua