fix(helm): update chart thanos to 15.7.3

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.2 -> 15.7.3

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Release Notes

bitnami/charts (thanos)

### [`v15.7.3`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/thanos/CHANGELOG.md#1573-2024-06-10) - \[bitnami/thanos] add service monitor labels ([#​26880](https://togithub.com/bitnami/charts/pull/26880))

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