chore(deps): update helm release postgresql to v15.5.30

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change	Pending
postgresql (source)	patch	15.5.29 -> 15.5.30	15.5.31

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.30`](https://redirect.github.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#15530-2024-09-12) - \[bitnami/postgresql] collect metrics as postgres user ([#​29201](https://redirect.github.com/bitnami/charts/pull/29201))

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