use subprocess.DEVNULL instead of open(os.devnull) to avoid leaking a…

[graingert]

… file handle

fixes #13328

Thanks for contributing to Selenium!
A PR well described will help maintainers to quickly review and merge it

Before submitting your PR, please check our contributing guidelines.
Avoid large PRs, help reviewers by making them as simple and short as possible.

Description

Motivation and Context

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing document.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (343aa78) 58.04% compared to head (11a9081) 58.05%.

❗ Current head 11a9081 differs from pull request most recent head b8ff036. Consider uploading reports for the commit b8ff036 to get more accurate results

Files	Patch %	Lines
py/selenium/webdriver/firefox/firefox_binary.py	50.00%	1 Missing ⚠️

❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk   #13329   +/-   ##
=======================================
  Coverage   58.04%   58.05%           
=======================================
  Files          88       88           
  Lines        5337     5338    +1     
  Branches      224      224           
=======================================
+ Hits         3098     3099    +1     
  Misses       2015     2015           
  Partials      224      224           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[diemol]

Can you please make the linter happy and I can merge this:

  import os
 import time
 from platform import system
-from subprocess import STDOUT, DEVNULL
+from subprocess import DEVNULL
+from subprocess import STDOUT
 from subprocess import Popen

https://github.com/SeleniumHQ/selenium/actions/runs/7249860032/job/19771842820?pr=13329#step:5:24

[diemol]

Thank you, @graingert!