Update docker.io/bitnami/postgresql Docker tag to v15.8.0-debian-12-r21

[vshn-renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/bitnami/postgresql (source)	patch	15.8.0-debian-12-r20 -> 15.8.0-debian-12-r21

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🚀 This PR has been released as v17.0.1

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