tree-from-tags: pin to ruby_3_1

pkgs/by-name/tr/tree-from-tags/gemset.nix

@@ -2,7 +2,7 @@
   taglib-ruby = {
     source = {
       remotes = [ "https://rubygems.org" ];
-      hash = "sha256-sZ+h9OOEHTz8e9uEXpPN4NjA8gNWAgDaIMIwZts/D2U=";
+      sha256 = "0r8g7zdncc6243d000jn0grc1n70rn9mx16vggy3q7c4wgsa37xi";
       type = "gem";
     };
     version = "0.7.1";

pkgs/by-name/tr/tree-from-tags/package.nix

@@ -44,7 +44,7 @@ stdenv.mkDerivation {
   meta = {
     description = "Create file hierarchies from media tags";
     homepage = "https://www.emacswiki.org/emacs/Bongo";
-    platforms = lib.ruby.meta.platforms;
+    platforms = ruby.meta.platforms;
     maintainers = with lib.maintainers; [
       livnev
       dbrock

pkgs/top-level/all-packages.nix

@@ -19349,4 +19349,8 @@ with pkgs;
   cantata = callPackage ../by-name/ca/cantata/package.nix {
     ffmpeg = ffmpeg_6;
   };
+
+  tree-from-tags = callPackage ../by-name/tr/tree-from-tags/package.nix {
+    ruby = ruby_3_1;
+  };
 }