iperf2: 2.0.11 -> 2.0.12

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

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

These checks were done:

- built on NixOS
- /nix/store/c7p3b3b353pssma0cg1wg78pfs6x2is3-iperf-2.0.12/bin/iperf passed the binary check.
- 1 of 1 passed binary check by having a zero exit code.
- 0 of 1 passed binary check by having the new version present in output.
- found 2.0.12 with grep in /nix/store/c7p3b3b353pssma0cg1wg78pfs6x2is3-iperf-2.0.12
- directory tree listing: https://gist.github.com/457110ea6db3cd3dbd6c9bc7ff82477a
- du listing: https://gist.github.com/86655ffd63846a5d3a473393af8e4da9

pkgs/tools/networking/iperf/2.nix

@@ -1,11 +1,11 @@
 { stdenv, fetchurl }:
 
 stdenv.mkDerivation rec {
-  name = "iperf-2.0.11";
+  name = "iperf-2.0.12";
 
   src = fetchurl {
     url = "mirror://sourceforge/iperf2/files/${name}.tar.gz";
-    sha256 = "1lm5inayc8fkqncj55fvzl9611rkmkj212lknmby7c3bgk851mmp";
+    sha256 = "0ii6sgp62x9ly2gyk00w58dy9qwcw2kvhhcfa7v16jr6n4gnazrn";
   };
 
   hardeningDisable = [ "format" ];