apt-archive.postgresql.org a bit broken?

Hello,

I get this when I try to access the archive of focal packages:

```
# apt-get update
[...]
Err:6 https://apt-archive.postgresql.org/pub/repos/apt focal-pgdg
InRelease
403 Forbidden [IP: 2600:9000:2761:4600:b:5965:3380:93a1 443]
[...]
E: Failed to fetch
https://apt-archive.postgresql.org/pub/repos/apt/dists/focal-pgdg/InRelease
403 Forbidden [IP: 2600:9000:2761:4600:b:5965:3380:93a1 443]
E: The repository 'https://apt-archive.postgresql.org/pub/repos/apt
focal-pgdg InRelease' is not signed.
N: Updating from such a repository can't be done securely, and is
therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user
configuration details.
```

And so I can't access old, archived focal packages. I guess this isn't
wanted behavior?

In case I should direct this problem report to some different place I'd
be glad if you would tell me.

Thank you,
*t