ci: update iovisor/bcc from a revision of 0.11.0-6021958a to 0.12.0
ci: update iovisor/bcc from a revision of 0.11.0-6021958a to 0.12.0

in order to make sure h2olog work on GitHub Actions

devnexen/h2o,devnexen/h2o,devnexen/h2o,devnexen/h2o,h2o/h2o,h2o/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,cwyang/h2o,devnexen/h2o,h2o/h2o,cwyang/h2o,yannick/h2o,cwyang/h2o,h2o/h2o,devnexen/h2o,cwyang/h2o,yannick/h2o,h2o/h2o,devnexen/h2o,yannick/h2o,yannick/h2o,cwyang/h2o,yannick/h2o,yannick/h2o,h2o/h2o,cwyang/h2o,h2o/h2o,h2o/h2o,devnexen/h2o,h2o/h2o