treewide: update homepages to https where available

Based on "problems" from repology:

https://repology.org/repository/nix_unstable/problems

Mostly simple changes to reflect redirects.

pkgs/development/libraries/lasso/default.nix

@@ -22,7 +22,7 @@ stdenv.mkDerivation rec {
   '';
 
   meta = with stdenv.lib; {
-    homepage = http://lasso.entrouvert.org/;
+    homepage = https://lasso.entrouvert.org/;
     description = "Liberty Alliance Single Sign-On library";
     license = licenses.gpl2Plus;
     platforms = platforms.linux;