Update postgresql Docker tag to v15.5.2

[small-hack-renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgresql (source)	patch	15.5.0 -> 15.5.2

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.2`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#1552-2024-06-04) - \[bitnami/postgresql] Bump chart version ([#​26660](https://togithub.com/bitnami/charts/pull/26660))

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