[BE] Fix import sorting to comply with latest usort version

[FindHao]

Problem: The GitHub CI format-check was failing with usort errors on placeholder_replacer.py and **utils.py**, even though local make format passed without issues. This was caused by version inconsistency - the CI server was using a newer version of usort than what was available locally.

Solution:

• Upgraded usort to the latest version locally
• Applied usort formatting to fix import ordering in the affected files
• This ensures consistency between local development and CI environments

Files Changed:

• tritonparse/reproducer/placeholder_replacer.py
• **utils.py**

Testing:

• ✅ make format-check passes locally
• ✅ All formatting tools (usort, ruff, black) complete successfully

[FindHao]

include all changes in #202