openvpn: 2.4.5 -> 2.4.6

Semi-automatic update generated by https://github.com/ryantm/nixpkgs-update tools.

This update was made based on information from https://repology.org/metapackage/openvpn/versions.

These checks were done:

- built on NixOS
- Warning: no binary found that responded to help or version flags. (This warning appears even if the package isn't expected to have binaries.)
- found 2.4.6 with grep in /nix/store/5hj70y409c0b01zmx4rddiicgq7jajb2-openvpn-2.4.6
- directory tree listing: https://gist.github.com/ce0bc5e31d7d26ead341febdc7bdc6ee

pkgs/tools/networking/openvpn/default.nix

@@ -10,11 +10,11 @@ with stdenv.lib;
 
 stdenv.mkDerivation rec {
   name = "openvpn-${version}";
-  version = "2.4.5";
+  version = "2.4.6";
 
   src = fetchurl {
     url = "http://swupdate.openvpn.net/community/releases/${name}.tar.xz";
-    sha256 = "17njq59hsraqyxrbhkrxr7dvx0p066s3pn8w1mi0yd9jldis7h23";
+    sha256 = "09lck4wmkas3iyrzaspin9gn3wiclqb1m9sf8diy7j8wakx38r2g";
   };
 
   nativeBuildInputs = [ pkgconfig ];