Python: many package updates

Did not test all packages. Likely we'll have some breakage.

pkgs/development/python-modules/pip-tools/default.nix

@@ -1,14 +1,14 @@
 { stdenv, fetchFromGitHub, buildPythonPackage, pip, pytest, click, six, first, glibcLocales }:
 buildPythonPackage rec {
   pname = "pip-tools";
-  version = "1.8.1rc3";
+  version = "1.9.0";
   name = "pip-tools-${version}";
 
   src = fetchFromGitHub {
     owner = "jazzband";
     repo = "pip-tools";
     rev = version;
-    sha256 = "09rbgzj71bfp1x1jfr1zx3vax4qjbw5l6vcd3fqvshsdvg9lcnpx";
+    sha256 = "0706feb27263a2dade6d39cc508e718282bd08f455d0643f251659f905be4d56";
   };
 
   LC_ALL = "en_US.UTF-8";