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/tools/networking/dropbear/default.nix

@@ -31,7 +31,7 @@ stdenv.mkDerivation rec {
   buildInputs = [ zlib ] ++ lib.optionals enableStatic [ glibc.static zlib.static ];
 
   meta = with stdenv.lib; {
-    homepage = "http://matt.ucc.asn.au/dropbear/dropbear.html";
+    homepage = "https://matt.ucc.asn.au/dropbear/dropbear.html";
     description = "A small footprint implementation of the SSH 2 protocol";
     license = licenses.mit;
     maintainers = with maintainers; [ abbradar ];