Update util.rb to fix closing of file.

When attempting to close files, the /proc/self loop was trying to close a file being converted to an integer which was causing issues on Fedora 42, this resolved the problem.

Author: adamboutcher

lib/puppet/util.rb

@@ -481,7 +481,7 @@ def safe_posix_fork(stdin = $stdin, stdout = $stdout, stderr = $stderr, &block)
         Dir.foreach('/proc/self/fd') do |f|
           if f != '.' && f != '..' && f.to_i >= 3
             begin
-              IO.new(f.to_i).close
+              IO.new(f).close
             rescue
               nil
             end