Update dependency ruff to v0.6.8

[renovate[bot]]

This PR contains the following updates:

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

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Release Notes

astral-sh/ruff (ruff)

### [`v0.6.8`](https://redirect.github.com/astral-sh/ruff/blob/HEAD/CHANGELOG.md#068) [Compare Source](https://redirect.github.com/astral-sh/ruff/compare/0.6.7...0.6.8) ##### Preview features - Remove unnecessary parentheses around `match case` clauses ([#​13510](https://redirect.github.com/astral-sh/ruff/pull/13510)) - Parenthesize overlong `if` guards in `match..case` clauses ([#​13513](https://redirect.github.com/astral-sh/ruff/pull/13513)) - Detect basic wildcard imports in `ruff analyze graph` ([#​13486](https://redirect.github.com/astral-sh/ruff/pull/13486)) - \[`pylint`] Implement `boolean-chained-comparison` (`R1716`) ([#​13435](https://redirect.github.com/astral-sh/ruff/pull/13435)) ##### Rule changes - \[`lake8-simplify`] Detect `SIM910` when using variadic keyword arguments, i.e., `**kwargs` ([#​13503](https://redirect.github.com/astral-sh/ruff/pull/13503)) - \[`pyupgrade`] Avoid false negatives with non-reference shadowed bindings of loop variables (`UP028`) ([#​13504](https://redirect.github.com/astral-sh/ruff/pull/13504)) ##### Bug fixes - Detect tuples bound to variadic positional arguments i.e. `*args` ([#​13512](https://redirect.github.com/astral-sh/ruff/pull/13512)) - Exit gracefully on broken pipe errors ([#​13485](https://redirect.github.com/astral-sh/ruff/pull/13485)) - Avoid panic when analyze graph hits broken pipe ([#​13484](https://redirect.github.com/astral-sh/ruff/pull/13484)) ##### Performance - Reuse `BTreeSets` in module resolver ([#​13440](https://redirect.github.com/astral-sh/ruff/pull/13440)) - Skip traversal for non-compound statements ([#​13441](https://redirect.github.com/astral-sh/ruff/pull/13441))

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