Fix flaky tests

[nobu]

Description

"1234" is too short and may be included in tempfile paths.

https://github.com/ruby/ruby/actions/runs/10659931295/job/29543206549?pr=11529#step:13:369

    Expected not to include `/1234/` in
    (
    [1, 5] in /var/folders/m4/5dz5h26x329cqq4fx333f8gm0000gn/T/debug-20240902-41234-6fxkst.rb
         1| a = 1
         2| b = 2
         3| 
         4| 1/0 rescue nil
    =>   5| binding.b
    =>#0	<main> at /var/folders/m4/5dz5h26x329cqq4fx333f8gm0000gn/T/debug-20240902-41234-6fxkst.rb:5
    )
     on LOCAL mode.

[launchable-app]

✅ All Tests passed!

✖️no tests failed ✔️669 tests passed(1 flake)