fix(helm): update chart thanos to 15.7.15

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.13 -> 15.7.15

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Release Notes

bitnami/charts (thanos)

### [`v15.7.15`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#15715-2024-07-25) - \[bitnami/thanos] Release 15.7.15 ([#​28508](https://togithub.com/bitnami/charts/pull/28508)) ### [`v15.7.14`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#15714-2024-07-24) - \[bitnami/thanos] Release 15.7.14 ([#​28386](https://togithub.com/bitnami/charts/pull/28386))

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