Daily cron works, but segfaults at the end

[wilzbach]

The daily cron seems to work nicely as can be seen with the auto-labelled issues:

• https://github.com/dlang/phobos/issues?q=is%3Aopen+is%3Apr+label%3Astalled
• https://github.com/dlang/phobos/pulls?q=is%3Aopen+is%3Apr+label%3A%22needs+rebase%22
• https://github.com/dlang/phobos/pulls?q=is%3Aopen+is%3Apr+label%3A%22needs+work%22

However, after an yet unknown issue, it segfaults.
This isn't a serious problems as it will just stop to label prs, but we should definitely investigate this.