Update Helm release thanos to v15.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
thanos (source)	minor	15.7.29 -> 15.8.0

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Release Notes

bitnami/charts (thanos)

### [`v15.8.0`](https://redirect.github.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#1580-2024-10-15) - \[bitnami/thanos] Add compactor dataDir setting ([#​29856](https://redirect.github.com/bitnami/charts/pull/29856))

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