- Update postgres Docker tag to v16

[blumilk-renovate]

This PR contains the following updates:

Package	Type	Update	Change
postgres	service	major	15 -> 16
postgres		major	15 -> 16

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[mtracz]

Major version upgrade should be properly processed with current data migration. Also it should be done version by version, 15 -> 16 -> 17 -> 18

• https://www.postgresql.org/support/versioning/
• https://www.postgresql.org/docs/15/pgupgrade.html
• https://github.com/pgautoupgrade/docker-pgautoupgrade
• https://helgeklein.com/blog/upgrading-postgresql-in-docker-container/

[blumilk-renovate]

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