Update dependency ruff to v0.6.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ruff (source, changelog)	0.6.7 -> 0.6.8

---

Release Notes

astral-sh/ruff (ruff)

v0.6.8

Compare Source

Preview features

• Remove unnecessary parentheses around match case clauses (#​13510)
• Parenthesize overlong if guards in match..case clauses (#​13513)
• Detect basic wildcard imports in ruff analyze graph (#​13486)
• [pylint] Implement boolean-chained-comparison (R1716) (#​13435)

Rule changes

• [lake8-simplify] Detect SIM910 when using variadic keyword arguments, i.e., **kwargs (#​13503)
• [pyupgrade] Avoid false negatives with non-reference shadowed bindings of loop variables (UP028) (#​13504)

Bug fixes

• Detect tuples bound to variadic positional arguments i.e. *args (#​13512)
• Exit gracefully on broken pipe errors (#​13485)
• Avoid panic when analyze graph hits broken pipe (#​13484)

Performance

• Reuse BTreeSets in module resolver (#​13440)
• Skip traversal for non-compound statements (#​13441)

---

Configuration

📅 Schedule: Branch creation - "before 4am" (UTC), Automerge - "before 4am" (UTC).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.