vpn-slice: fix script startup with python > 3.11 on darwin, modernize a little (#385356)

pkgs/tools/networking/vpn-slice/default.nix

@@ -13,10 +13,11 @@
 buildPythonApplication rec {
   pname = "vpn-slice";
   version = "0.16.1";
+  pyproject = true;
 
   src = fetchFromGitHub {
     owner = "dlenski";
-    repo = pname;
+    repo = "vpn-slice";
     rev = "v${version}";
     sha256 = "sha256-T6VULLNRLWO4OcAsuTmhty6H4EhinyxQSg0dfv2DUJs=";
   };
@@ -24,15 +25,20 @@ buildPythonApplication rec {
   postPatch =
     lib.optionalString stdenv.hostPlatform.isDarwin ''
       substituteInPlace vpn_slice/mac.py \
-        --replace "'/sbin/route'" "'${unixtools.route}/bin/route'"
+        --replace-fail "'/sbin/route'" "'${unixtools.route}/bin/route'"
     ''
     + lib.optionalString stdenv.hostPlatform.isLinux ''
       substituteInPlace vpn_slice/linux.py \
-        --replace "'/sbin/ip'" "'${iproute2}/bin/ip'" \
-        --replace "'/sbin/iptables'" "'${iptables}/bin/iptables'"
+        --replace-fail "'/sbin/ip'" "'${iproute2}/bin/ip'" \
+        --replace-fail "'/sbin/iptables'" "'${iptables}/bin/iptables'"
     '';
 
-  propagatedBuildInputs = with python3Packages; [
+  build-system = with python3Packages; [
+    setuptools
+  ];
+
+  dependencies = with python3Packages; [
+    setuptools # can be removed with next package update, upstream no longer has a dependency on distutils
     setproctitle
     dnspython
   ];