ruby: move towards ruby 3

Currently, `pkgs.ruby` is ruby 2.7.6, which is in 'security updates
only' mode and scheduled to go EOL April 2023. Updating `pkgs.ruby`
to be ruby 3.1 would be a rather large change, but using ruby 3 to
bootstrap building ruby itself would be a nice first step in that
direction.

Tested with asciidoctor that this indeed now allows building a ruby
application without getting ruby 2.7 in the build closure.

Also fixes #192729

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/development/interpreters/ruby/default.nix b/pkgs/development/interpreters/ruby/default.nix
index 524734b5a5fac..dc7594da17d92 100644
--- a/pkgs/development/interpreters/ruby/default.nix
+++ b/pkgs/development/interpreters/ruby/default.nix
@@ -48,7 +48,7 @@ let
       , buildEnv, bundler, bundix
       , libiconv, libobjc, libunwind, Foundation
       , makeWrapper, buildRubyGem, defaultGemConfig
-      , baseRuby ? buildPackages.ruby.override {
+      , baseRuby ? buildPackages.ruby_3_1.override {
           useRailsExpress = false;
           docSupport = false;
           rubygemsSupport = false;