CI: Flaky 'does retries correctly when #try_write fails' test

[Watson1978]

Describe the bug

Sometimes, 'does retries correctly when #try_write fails' test fails on CI

fluentd/test/plugin/test_output_as_buffered_retries.rb

Line 915 in 8a4506b

test 'does retries correctly when #try_write fails' do

1) Failure: test: does retries correctly when #try_write fails(BufferedOutputRetryTest::buffered output with delayed commit): <false> is not true.
/Users/runner/work/fluentd/fluentd/test/plugin/test_output_as_buffered_retries.rb:963:in `block (2 levels) in <class:BufferedOutputRetryTest>'
     960:       end
     961: 
     962:       assert(@i.write_count > 1)
  => 963:       assert(@i.num_errors > 1)
     964:     end
     965:   end
     966: end

To Reproduce

Run CI

Expected behavior

No error

Your Environment

- Fluentd version:
- Package version:
- Operating system:
- Kernel version:

Your Configuration

none

Your Error Log

See above

Additional context

No response