fix(charts): update helm release thanos to v15.7.18

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.17 -> 15.7.18

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Release Notes

bitnami/charts (thanos)

### [`v15.7.18`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#15718-2024-08-07) - \[bitnami/thanos] Release 15.7.18 ([#​28752](https://togithub.com/bitnami/charts/pull/28752))

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[github-actions[bot]]

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