Bundler higher than ~> 2.4.0 will require Ruby 3.0 or later

Author: deivid-rodriguez

bundler.js

@@ -108,6 +108,7 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
 
   // Use Bundler 1 when we know Bundler 2 does not work
   // Use Bundler 2.3 when we use Ruby 2.3.2-2.5
+  // Use Bundler 2.4 when we use Ruby 2.6-2.7
   if (bundlerVersion.startsWith('2')) {
     if (engine === 'ruby' && floatVersion <= 2.2) {
       console.log('Bundler 2 requires Ruby 2.3+, using Bundler 1 on Ruby <= 2.2')
@@ -118,6 +119,9 @@ export async function installBundler(bundlerVersionInput, rubygemsInputSet, lock
     } else if (engine === 'ruby' && floatVersion <= 2.5) {
       console.log('Ruby 2.3.2-2.5 only works with Bundler 2.3')
       bundlerVersion = '2.3'
+    } else if (engine === 'ruby' && floatVersion <= 2.7) {
+      console.log('Ruby 2.6-2.7 only works with Bundler 2.4')
+      bundlerVersion = '2.4'
     } else if (engine === 'jruby' && rubyVersion.startsWith('9.1')) { // JRuby 9.1 targets Ruby 2.3, treat it the same
       console.log('JRuby 9.1 has a bug with Bundler 2 (https://github.com/ruby/setup-ruby/issues/108), using Bundler 1 instead on JRuby 9.1')
       bundlerVersion = '1'