Update postgres Docker tag to v16

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
postgres	major	13 -> 16

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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Additional details and impacted files

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  Misses          ?     3152           
  Partials        ?        0           

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[Turbo87]

We're planning on upgrading our production database within the next couple of weeks. This PR should only get merged once that has happened.

[Turbo87]

We've migrated from Heroku Postgres to https://crunchybridge.com/ today and that included a migration to Postgres 16. in other words: this PR is unblocked now and can be merged 🎉