fix(helm): update chart thanos to 15.7.9

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.6 -> 15.7.9

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Release Notes

bitnami/charts (thanos)

### [`v15.7.9`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#1579-2024-06-18) - \[bitnami/thanos] Release 15.7.9 ([#​27424](https://togithub.com/bitnami/charts/pull/27424)) ### [`v15.7.8`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#1578-2024-06-17) - \[bitnami/thanos] fix thanos dual-stack receive monitoring ([#​27112](https://togithub.com/bitnami/charts/pull/27112)) ### [`v15.7.7`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#1577-2024-06-17) - \[bitnami/thanos] Release 15.7.7 ([#​27294](https://togithub.com/bitnami/charts/pull/27294))

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