hpx: 1.2.0 -> 1.2.1

Semi-automatic update generated by
https://github.com/ryantm/nixpkgs-update tools. This update was made
based on information from
https://repology.org/metapackage/hpx/versions

pkgs/development/libraries/hpx/default.nix

@@ -2,13 +2,13 @@
 
 stdenv.mkDerivation rec {
   name = "hpx-${version}";
-  version = "1.2.0";
+  version = "1.2.1";
 
   src = fetchFromGitHub {
     owner = "STEllAR-GROUP";
     repo = "hpx";
     rev = "${version}";
-    sha256 = "1rliv42glns60bpmmvmgrglgmii42p8bmji349r6mr68f48iv4dx";
+    sha256 = "18dk9413qcgljdlw2jfkk21lwi4iwc57s41yqnc3jp8vdj96w32s";
   };
 
   buildInputs = [ boost hwloc gperftools ];