Ruby 3.2 compatibility - close #163

build_tests/simple/builder_wait_for_builder.rb

@@ -1,7 +1,7 @@
 class MyObject < Rscons::Builder
   def run(options)
     if @builder
-      if File.exists?(@target)
+      if File.exist?(@target)
         true
       else
         false

build_tests/simple/user_dep_build_order.rb

@@ -4,7 +4,7 @@ class TestBuilder < Rscons::Builder
       true
     else
       if @target == "two"
-        return false unless File.exists?("one")
+        return false unless File.exist?("one")
       end
       wait_time = @env.expand_varref("${wait_time}", @vars)
       @command = ["ruby", "-e", "require 'fileutils'; sleep #{wait_time}; FileUtils.touch('#{@target}');"]