Add runtime dependency to resolve errors that occurred when import robot.

Robot Framework 4.1 is a feature release with several nice enhancements, for example, to the continue-on-failure mode and argument conversion, as well as some bug fixes.

Signed-off-by: Zang Ruochen <zangrc.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>