Update Helm release thanos to v15.7.29

This MR contains the following updates:

Package	Update	Change
thanos (source)	patch	15.7.25 -> 15.7.29

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Release Notes

bitnami/charts (thanos)

v15.7.29

• [bitnami/thanos] Add customAutoScaling flag (#​29849)

v15.7.28

• [bitnami/thanos] Revert #​29673 (#​29763) (0e20117), closes #​29673 #​29763

v15.7.27

• [bitnami/thanos] Release 15.7.27 (#​29720) (cd99907), closes #​29720

v15.7.26

• [bitnami/thanos] Fix serviceNames based on additionalHeadless (#​29673) (418a890), closes #​29673

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