chore(deps): update helm chart postgresql to v15.5.38

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This PR contains the following updates:

Package	Update	Change
postgresql (source)	patch	15.5.37 -> 15.5.38

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.38`](https://redirect.github.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#15538-2024-10-01) - \[bitnami/postgresql] Release 15.5.38 ([#​29681](https://redirect.github.com/bitnami/charts/pull/29681))

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