Debian Testing (Trixie) can't install - libgconf-2-4 dependency not available in repos

Seems like Debian Testing (Trixie) can no longer install Keybase due to missing libgconf dependency. Are there work-arounds / fixes in the works? I did some googling for fixes, and also looked in the issues as best I could. I didn't see anything related.

```
$ sudo apt install keybase
Reading package lists... Done
Building dependency tree... Done
Reading state information... Done
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:

The following packages have unmet dependencies:
keybase : Depends: libgconf-2-4 but it is not installable
E: Unable to correct problems, you have held broken packages.
```

```
$ cat /etc/apt/sources.list.d/keybase.list
### THIS FILE IS AUTOMATICALLY CONFIGURED ###
# You may comment out this entry, but any other modifications may be lost.
deb [signed-by=/usr/share/keyrings/keybase-keyring.gpg] http://prerelease.keybase.io/deb stable main
```

Reproduce the failure on Debian Testing (Trixie) using the keybase apt source shown in the issue. Inspect the Debian package metadata for keybase and its libgconf-2-4 dependency, then verify any packaging adjustment or documented workaround by repeating the installation command. Done means Keybase installs successfully on Trixie without an unavailable dependency.

Written by the indexing model from the issue text.