treewide: update some homepage URLs

Updated dead or redirecting URLs on packages maintained by me.

pkgs/applications/misc/qlcplus/default.nix

@@ -40,6 +40,6 @@ mkDerivation rec {
     maintainers = [ maintainers.globin ];
     license = licenses.asl20;
     platforms = platforms.all;
-    homepage = "http://www.qlcplus.org/";
+    homepage = "https://www.qlcplus.org/";
   };
 }

pkgs/applications/misc/zathura/wrapper.nix

@@ -17,7 +17,7 @@ in symlinkJoin {
   '';
 
   meta = with lib; {
-    homepage = https://pwmt.org/projects/zathura/;
+    homepage = https://git.pwmt.org/pwmt/zathura/;
     description = "A highly customizable and functional PDF viewer";
     longDescription = ''
       Zathura is a highly customizable and functional PDF viewer based on the

pkgs/os-specific/linux/zfs/default.nix

@@ -140,7 +140,7 @@ let
           Copy-On-Write filesystem with data integrity detection and repair,
           snapshotting, cloning, block devices, deduplication, and more.
         '';
-        homepage = http://zfsonlinux.org/;
+        homepage = https://zfsonlinux.org/;
         license = licenses.cddl;
         platforms = platforms.linux;
         maintainers = with maintainers; [ jcumming wizeman fpletz globin ];

pkgs/tools/graphics/scrot/default.nix

@@ -16,7 +16,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ giblib xlibsWrapper libXfixes libXcursor ];
 
   meta = with stdenv.lib; {
-    homepage = http://linuxbrit.co.uk/scrot/;
+    homepage = https://github.com/resurrecting-open-source-projects/scrot;
     description = "A command-line screen capture utility";
     platforms = platforms.linux;
     maintainers = with maintainers; [ globin ];