Update openhands-resolver.yml to remove issue number

[neubig]

End-user friendly description of the problem this fixes or functionality that this introduces

• Include this change in the Release Notes. If checked, you must provide an end-user friendly description for your change below

A change was made to remove issue_number from the upstream github resolver workflow, this change is necessary to make it work.

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To run this PR locally, use the following command:

docker run -it --rm   -p 3000:3000   -v /var/run/docker.sock:/var/run/docker.sock   --add-host host.docker.internal:host-gateway   -e SANDBOX_RUNTIME_CONTAINER_IMAGE=docker.all-hands.dev/all-hands-ai/runtime:deae225-nikolaik   --name openhands-app-deae225   docker.all-hands.dev/all-hands-ai/openhands:deae225