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/misc/emulators/stella/default.nix

@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
     maintained by Stephen Anthony.
     As of its 3.5 release, Stella is officially donationware. 
     '';
-    homepage = "http://stella-emu.github.io/";
+    homepage = "https://stella-emu.github.io/";
     license = licenses.gpl2;
     maintainers = [ maintainers.AndersonTorres ];
     platforms = platforms.linux;

pkgs/misc/solfege/default.nix

@@ -39,7 +39,7 @@ buildPythonApplication rec {
 
   meta = with lib; {
     description = "Ear training program";
-    homepage = "http://www.solfege.org/";
+    homepage = "https://www.solfege.org/";
     license = licenses.gpl3;
     platforms = platforms.linux;
     maintainers = with maintainers; [ bjornfor orivej ];

pkgs/misc/sound-of-sorting/default.nix

@@ -21,7 +21,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "Audibilization and Visualization of Sorting Algorithms";
-    homepage = "http://panthema.net/2013/sound-of-sorting/";
+    homepage = "https://panthema.net/2013/sound-of-sorting/";
     license = with licenses; gpl3;
     maintainers = with maintainers; [ AndersonTorres ];
   };