The last successful roll was a week ago in flutter/engine#45216

The roller failed to create a CL with:
failed pre-upload step: Error when running dart license script: Command exited with exit status 1: /data/src/third_party/dart/tools/sdks/dart-sdk/bin/dart --interpret_irregexp lib/main.dart --src ../../.. --out /data/src/out/licenses --golden /data/src/flutter/ci/licenses_golden. At deps_local.go:174 git_common.go:160 git_checkout.go:77 autoroller.go:488 autoroller.go:444 state_machine.go:291 state_machine.go:53 state_machine.go:168 state_machine.go:914 state_machine.go:927 state_machine.go:933 autoroller.go:780 autoroller.go:338 util.go:383 cleanup.go:57 asm_amd64.s:1594

cc @arbreng