chore: update ruff pre-commit hook to v0.15.0

Align pre-commit ruff version with the version resolved in uv.lock
to prevent local/CI lint result discrepancies.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: cotovanu-cristian

.pre-commit-config.yaml

@@ -1,6 +1,6 @@
 repos:
 - repo: https://github.com/astral-sh/ruff-pre-commit
-  rev: v0.9.6
+  rev: v0.15.0
   hooks:
     - id: ruff
       args: [ --fix ]