ruby: update default version to ruby_3_1

pkgs/development/interpreters/ruby/default.nix

@@ -51,7 +51,7 @@ let
       , buildEnv, bundler, bundix
       , libiconv, libobjc, libunwind, Foundation
       , makeBinaryWrapper, buildRubyGem, defaultGemConfig
-      , baseRuby ? buildPackages.ruby_3_1.override {
+      , baseRuby ? buildPackages.ruby.override {
           docSupport = false;
           rubygemsSupport = false;
         }

pkgs/top-level/all-packages.nix

@@ -5864,13 +5864,7 @@ with pkgs;
     enableExtraPlugins = true;
   };
 
-  asciidoctor = callPackage ../tools/typesetting/asciidoctor {
-    bundlerApp = bundlerApp.override {
-      # asciidoc supports both ruby 2 and 3,
-      # but we don't want to be stuck on it:
-      ruby = ruby_3_1;
-    };
-  };
+  asciidoctor = callPackage ../tools/typesetting/asciidoctor { };
 
   asciidoctor-with-extensions = callPackage ../tools/typesetting/asciidoctor-with-extensions { };
 
@@ -17012,8 +17006,8 @@ with pkgs;
     ruby_3_1
     ruby_3_2;
 
-  ruby = ruby_2_7;
-  rubyPackages = rubyPackages_2_7;
+  ruby = ruby_3_1;
+  rubyPackages = rubyPackages_3_1;
 
   rubyPackages_2_7 = recurseIntoAttrs ruby_2_7.gems;
   rubyPackages_3_0 = recurseIntoAttrs ruby_3_0.gems;