Remove the "automerge" label #1080

Note: This repo is for the Python devguide. If you are requesting an
enhancement for the Python language or CPython interpreter,
then the CPython issue tracker is better
suited for this report: https://github.com/python/cpython/issues

Describe the enhancement or feature you'd like
Prepare a PR for removing the "automerge" label from the Triage > Labels page https://devguide.python.org/triage/labels/

Additional context
After #1079 is done, and after the label has actually been removed, we should update the doc. The PR for removing it from the doc can be prepared in advance.