Fix TypeError with yapf>=0.32 during config formatting

[shihangan]

Problem

Training crashes immediately when using yapf >= 0.32 with the following error:
TypeError: FormatCode() got an unexpected keyword argument 'verify'
This occurs in util/slconfig.py line 317, where the config object is formatted before saving to logs/.../config_cfg.py.

Root Cause

yapf removed the verify parameter in version 0.32.0, but DINO still passes verify=True. Since most users now install yapf >= 0.32 by default (pip install yapf), this affects all new environments.

Solution

This PR adds a try-except fallback:

• If yapf < 0.32 (old): verify=True works as before
• If yapf >= 0.32 (new): catches TypeError and calls without the parameter

No behavior change — newer yapf versions perform verification internally by default.

Testing

Tested on:

• yapf 0.31.0 (old): verify=True accepted, config file formatted correctly
• yapf 0.40.2 (new): falls back to no parameter, config file formatted correctly
• Training runs successfully on both versions

Checklist

• Code follows the project's style guidelines
• Tested with both old and new yapf versions
• No functional changes to model training or inference