pythonPackages.osprofiler: remove argparse from requirements

Since argparse module is now part of python stdlib.

pkgs/top-level/python-packages.nix

@@ -15014,7 +15014,7 @@ in {
     };
 
     propagatedBuildInputs = with self; [
-      pbr argparse six webob
+      pbr six webob
     ];
     buildInputs = with self; [
       oslosphinx coverage mock subunit testrepository testtools
@@ -15022,6 +15022,7 @@ in {
 
     patchPhase = ''
       sed -i 's@python@${python.interpreter}@' .testr.conf
+      substituteInPlace requirements.txt --replace "argparse" ""
     '';
   };