Add pull_request_target to prEvents

[jurijzahn8019]

Hi there!

i am using pull_request_target as trigger in some workflows.
Since this is basically same trigger as the pull_request trigger, they should be handled similary.

checks-action/src/main.ts

Lines 13 to 16 in 3d24d48

	const prEvents = [
	'pull_request',
	'pull_request_review',
	'pull_request_review_comment',

Thanks!

[LouisBrunner]

Published the change as part of v1.3.0