treewide: http -> https sources (#42676)

* treewide: http -> https sources

This updates the source urls of all top-level packages from http to
https where possible.

* buildtorrent: fix url and tab -> spaces

pkgs/development/libraries/cairomm/default.nix

@@ -7,7 +7,7 @@ stdenv.mkDerivation rec {
   name = "cairomm-${ver_maj}.${ver_min}";
 
   src = fetchurl {
-    url = "http://www.cairographics.org/releases/${name}.tar.gz";
+    url = "https://www.cairographics.org/releases/${name}.tar.gz";
     # gnome doesn't have the latest version ATM; beware: same name but different hash
     # url = "mirror://gnome/sources/cairomm/${ver_maj}/${name}.tar.xz";
     sha256 = "16fmigxsaz85c3lgcls7biwyz8zy8c8h3jndfm54cxxas3a7zi25";