v0.9.6.8

Downgrade plaso to 20250918 to match Timesketch bundled version

Fixes "Format of storage file not supported" error caused by
plaso version mismatch. The winevtx bug fix is now applied via
mounted winevt_rc.py in timesketch-worker instead.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>