chore(deps): update helm release postgresql to v15.5.15

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgresql (source)	patch	15.5.14 -> 15.5.15

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Release Notes

bitnami/charts (postgresql)

### [`v15.5.15`](https://togithub.com/bitnami/charts/blob/HEAD/bitnami/postgresql/CHANGELOG.md#15515-2024-07-08) - Postgres exporter URI fix ([#​27734](https://togithub.com/bitnami/charts/pull/27734))

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