upgrade to catalina: cannot send log

Keybase GUI Version: 2.12.5-20190101204726+c4dec09f95

```
% keybase log send
This command will send recent keybase log entries to keybase.io
for debugging purposes only.

These logs don’t include your private keys or encrypted data,
but they will include filenames and other metadata keybase normally
can’t read, for debugging purposes.

Continue sending logs to keybase.io? (type 'YES' to confirm): YES
Enter feedback (or to send): no fuse slots to mount /keybase in finder
More feedback (or press when done):

▶ ERROR API network error: Post https://api-0.core.keybaseapi.com/_/api/1.0/logdump/send.json: net/http: request canceled (Client.Timeout exceeded while awaiting headers)

```

Start by reproducing `keybase log send` on macOS Catalina using the version and confirmation flow shown in the report. Trace the log-upload entry point and observe the API request failure; done means the command can submit the log without the reported client-timeout error, with regression coverage if the existing test structure supports it.

Written by the indexing model from the issue text.