opensnitch-ui: migrate to python-slugify to fix build

pkgs/by-name/op/opensnitch-ui/package.nix

···
   inherit (opensnitch) src version;
   sourceRoot = "${opensnitch.src.name}/ui";
 
+  patches = [
+    # https://github.com/evilsocket/opensnitch/pull/1413
+    # unicode-slugify has failing tests and is overall unmaintained and broken.
+    # python-slugify is a preferrable replacement
+    ./use_python_slugify.patch
+  ];
+
   postPatch = ''
     substituteInPlace opensnitch/utils/__init__.py \
       --replace-fail /usr/lib/python3/dist-packages/data ${python3Packages.pyasn}/${python3Packages.python.sitePackages}/pyasn/data
···
     pyinotify
     pyqt5
     qt-material
-    unicode-slugify
+    python-slugify
     unidecode
   ];
 

pkgs/by-name/op/opensnitch-ui/use_python_slugify.patch

···
+diff --git a/requirements.txt b/requirements.txt
+index 66e0de13..68d651b1 100644
+--- a/requirements.txt
++++ b/requirements.txt
+@@ -1,5 +1,5 @@
+ grpcio-tools>=1.10.1
+ pyinotify==0.9.6
+-unicode_slugify==0.1.5
++python-slugify>=7.0.0
+ pyqt5>=5.6
+ protobuf