Update pre-commit hook astral-sh/ruff-pre-commit to v0.6.8

Author: renovate[bot]

.pre-commit-config.yaml

@@ -12,7 +12,7 @@ default_language_version:
 repos:
   # Run manually in CI skipping the branch checks
   - repo: https://github.com/astral-sh/ruff-pre-commit
-    rev: v0.6.7
+    rev: v0.6.8
     hooks:
       - id: ruff
         name: "Ruff-ing code"