chore(deps): update helm release postgresql to v15.5.7

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgresql (source)	patch	15.5.5 -> 15.5.7

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.7`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#1557-2024-06-18) - \[bitnami/postgresql] Release 15.5.7 ([#​27401](https://togithub.com/bitnami/charts/pull/27401)) ### [`v15.5.6`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#1556-2024-06-17) - \[bitnami/postgresql] Release 15.5.6 ([#​27293](https://togithub.com/bitnami/charts/pull/27293))

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