python311Packages.pkg-about: remove unneeded tox dependancy; fix build

tox is listed as a build requirement but it is never used. however, it
is breaking the build due to a tox dependency, cachetools, failing a
version check. Updating cachetools causes over 600 rebuilds.

https://github.com/karpierz/pkg_about/blob/1.0.8/pyproject.toml

pkgs/development/python-modules/pkg-about/default.nix

@@ -7,7 +7,6 @@
 , setuptools
 , packaging
 , tomli
-, tox
 }:
 
 buildPythonPackage rec {
@@ -24,10 +23,15 @@ buildPythonPackage rec {
     hash = "sha256-mb43XbKypgilagXLW33kP8wXxioNsfLtl6AEnOI1WlA=";
   };
 
+  # tox is listed in build requirements but not actually used to build
+  # keeping it as a requirement breaks the build unnecessarily
+  postPatch = ''
+    sed  -i "/requires/s/, 'tox>=3.25.1'//"  pyproject.toml
+  '';
+
   nativeBuildInputs = [
     packaging
     setuptools
-    tox
   ];
 
   propagatedBuildInputs = [