Update docker.io/bitnami/postgresql Docker tag to v15.8.0-debian-12-r15

[vshn-renovate]

This PR contains the following updates:

Package	Update	Change
docker.io/bitnami/postgresql (source)	patch	15.8.0-debian-12-r14 -> 15.8.0-debian-12-r15

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This PR has been generated by Renovate Bot.

[github-actions[bot]]

🚀 This PR has been released as v16.1.3

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🛠️ Auto tagging enabled with label bump:patch