feat: switch heroku postgres basic to essential-0

[vishnu-narayanan]

Pull Request Template

Description

Fixes https://linear.app/chatwoot/issue/CW-3299/upgrade-heroku-postgres-dynos-from-basic-to-essential-0-plan

We’re deprecating mini and basic Heroku Postgres plans on the Essential-tier. The planned end-of-life date for mini and basic plans is May 22, 2024. If your review apps and CI apps use mini or basic databases in the app.json, you must update them to the new Essential-tier plans before the EOL date. If not, no action is required as we’ll migrate these add-ons to the new Essential-tier plans when they’re generally available.

Ref: https://devcenter.heroku.com/changelog-items/2862

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[linear]

CW-3299 upgrade heroku postgres dynos from basic to essential-0 plan