[ruby/irb] Try using a different file name

hoping to address:
https://github.com/ruby/ruby/actions/runs/3506561941/jobs/5873689640

https://github.com/ruby/irb/commit/de9a6b9d00

test/irb/test_cmd.rb

@@ -617,7 +617,7 @@ module TestIRB
 
       def test_edit_with_non_existing_path
         out, err = execute_lines(
-          "edit foo.rb"
+          "edit test_cmd_non_existing_path.rb"
         )
 
         assert_empty err