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/python-modules/unicodedata2/default.nix

@@ -16,7 +16,7 @@ buildPythonPackage rec {
 
   meta = with lib; {
     description = "Backport and updates for the unicodedata module";
-    homepage = "http://github.com/mikekap/unicodedata2";
+    homepage = "https://github.com/mikekap/unicodedata2";
     license = licenses.asl20;
     maintainers = [ maintainers.sternenseemann ];
   };