base16-schemes: move to new repository

The former repository was deprecated in
https://github.com/tinted-theming/base16-schemes/commit/2b6f2d0677216ddda50c9cabd6ee70fae4665f81.

pkgs/data/themes/base16-schemes/default.nix

···
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "base16-schemes";
-  version = "unstable-2023-05-02";
+  version = "unstable-2024-01-14";
 
   src = fetchFromGitHub {
     owner = "tinted-theming";
-    repo = "base16-schemes";
-    rev = "9a4002f78dd1094c123169da243680b2fda3fe69";
-    sha256 = "sha256-AngNF++RZQB0l4M8pRgcv66pAcIPY+cCwmUOd+RBJKA=";
+    repo = "schemes";
+    rev = "395074124283df993571f2abb9c713f413b76e6e";
+    sha256 = "sha256-9LmwYbtTxNFiP+osqRUbOXghJXpYvyvAwBwW80JMO7s=";
   };
 
   installPhase = ''
     runHook preInstall
 
     mkdir -p $out/share/themes/
-    install *.yaml $out/share/themes/
+    install base16/*.yaml $out/share/themes/
 
     runHook postInstall
   '';