Update postgresql Docker tag to v13

[renovate]

This PR contains the following updates:

Package	Update	Change
postgresql	major	12.12.10 -> 13.1.5

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[renovate]

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[jessebot]

can't run the chart test action because it's blocked by helm/chart-testing-action#132

[jessebot]

I'm going to push this through anyway, but want to note that this is MAJOR bundled PostgreSQL upgrade, and so you need to follow the advice of Bitnami here:
https://github.com/bitnami/charts/tree/main/bitnami/postgresql#upgrading

Which is the follow the official instructions here:
https://www.postgresql.org/docs/16/upgrading.html

If you're not using the bundled Bitnami PostgreSQL sub chart, you can safely upgrade your mastodon helm chart with no worries <3