treewide: fix redirected urls (run 3)

Related:
 - 9fc5e7e473
 - 593e11fd94
 - 508ae42a0f

Since the last time I ran this script, the Repology API changed, so I had to
adapt the script used in the previous PR. The new API should be more robust, so
overall this is a positive (no more grepping the error messages for our relevant
data but just a nice json structure).

Here's the new script I used:

```sh
curl https://repology.org/api/v1/repository/nix_unstable/problems \
   | jq -r '.[] | select(.type == "homepage_permanent_https_redirect") | .data | "s@\(.url)@\(.target)@"' \
   | sort | uniq | tee script.sed
find -name '*.nix' | xargs -P4 -- sed -f script.sed -i
```

I will also add this script to `maintainers/scripts`.

pkgs/development/libraries/libguestfs/default.nix

@@ -14,7 +14,7 @@ stdenv.mkDerivation rec {
   version = "1.40.2";
 
   src = fetchurl {
-    url = "http://libguestfs.org/download/1.40-stable/${pname}-${version}.tar.gz";
+    url = "https://libguestfs.org/download/1.40-stable/${pname}-${version}.tar.gz";
     sha256 = "ad6562c48c38e922a314cb45a90996843d81045595c4917f66b02a6c2dfe8058";
   };
 
@@ -86,7 +86,7 @@ stdenv.mkDerivation rec {
   meta = with stdenv.lib; {
     description = "Tools for accessing and modifying virtual machine disk images";
     license = with licenses; [ gpl2 lgpl21 ];
-    homepage = "http://libguestfs.org/";
+    homepage = "https://libguestfs.org/";
     maintainers = with maintainers; [offline];
     platforms = platforms.linux;
   };