supabase / supavisor / 20980487347

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fix: support IPv6 in Postgres topology as well (#831)

## What kind of change does this PR introduce?

Bug fix: Supavisor failed to start up when having an IPv6-only Postgres
host, e.g. on fly.io's internal network.

## What is the current behavior?

After startup, supavisor will not be functional and loop error output
like this:
```
2026-01-12T16:38:56Z app[1853305f329658] fra [info]16:38:56.216 region=local [error] #PID<0.4921.0> (Postgrex.Notifications) failed to connect to Postgres: ** (DBConnection.ConnectionError) tcp connect (example-db.internal:5432): non-existing domain - :nxdomain
```

## What is the new behavior?

Supavisor starts up successfully and provides connectivity to the
postgres database.

## Additional context

(This was fixed as part of working on
https://github.com/SupaAutoFly/SupaAutoFly to support the latest
supabase self-hosted release.)

Co-authored-by: felipe stival <14948182+v0idpwn@users.noreply.github.com>

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