Update the backport action to 1.1.1-1, which adds support for issue
creation when a backport fails.
In our case, label the issue with the "backport" and "bug" labels.
Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
With new event 'pull_request_target' it is now possible to run the
backporting action that we used to have in the past as a Github app.
Use labels for backporting as before.
See https://github.com/tibdex/backport for more details.
Signed-off-by: Anas Nashif <anas.nashif@intel.com>