chore(deps): update helm release postgresql to v15.5.4

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgresql (source)	minor	15.4.2 -> 15.5.4

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.4`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#1554-2024-06-06) - \[bitnami/postgresql] Release 15.5.4 ([#​27006](https://togithub.com/bitnami/charts/pull/27006)) ### [`v15.5.3`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#small1553-2024-06-06-small) - \[bitnami/postgresql] Release 15.5.3 ([#​26914](https://togithub.com/bitnami/charts/issues/26914)) ([f7df496](https://togithub.com/bitnami/charts/commit/f7df496fce1cb33658e68af08d382287487e5b0b)), closes [#​26914](https://togithub.com/bitnami/charts/issues/26914) ### [`v15.5.1`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#small1551-2024-05-29-small) - \[bitnami/postgresql] Release 15.5.1 ([#​26546](https://togithub.com/bitnami/charts/issues/26546)) ([99f0841](https://togithub.com/bitnami/charts/commit/99f08414ce828db081402ba37cf48c0ad2624fee)), closes [#​26546](https://togithub.com/bitnami/charts/issues/26546) ### [`v15.5.0`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#1550-2024-05-29) - \[bitnami/postgresql] Enable PodDisruptionBudgets ([#​26530](https://togithub.com/bitnami/charts/issues/26530)) ([c6b2f1c](https://togithub.com/bitnami/charts/commit/c6b2f1cc32e0b9a8d884b61e8dc17f1089366d06)), closes [#​26530](https://togithub.com/bitnami/charts/issues/26530)

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