Pull latest data from the gh api instead of using the data from the event

[croissanne]

Instead of grabbing the data from the event, it should fetch the latest state of the PR from the github api. This includes updates the PR title, description, etc…

Currently you can open a PR without description, have the wf fail, update the description, and the wf will still fail.

[schuellerf]

is it possible, that just in the usage of the action (e.g. here) the activity "edited" has to be enabled? As by default (how I read the documentation) the action does not re-evaluate when the PR is edited.