required-review: Avoid requesting reviews from bots (#39895)

Attempting to request a review from a bot account will likely fail, as
bot accounts are not "collaborators".

Fortunately a bot account is probably going to look like
`@something[bot]`, so we can look for that to exclude them without
having to make extra API queries.

projects/github-actions/required-review/changelog/fix-required-review-no-request-review-from-bot

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fixed
+
+Avoid trying to request reviews from bot accounts.

projects/github-actions/required-review/src/request-review.js

@@ -21,7 +21,9 @@ async function requestReviewer( teams ) {
 	const teamReviews = [];
 
 	for ( const t of teams ) {
-		if ( t.startsWith( '@' ) ) {
+		if ( t.startsWith( '@' ) && t.endsWith( '[bot]' ) ) {
+			core.info( `Skipping ${ t }, appears to be a bot` );
+		} else if ( t.startsWith( '@' ) ) {
 			userReviews.push( t.slice( 1 ) );
 		} else {
 			teamReviews.push( t );