github: Fix Breaking Change label to match Release Drafter (#835)

Author: Dor-bl

.github/labeler.yml

@@ -26,7 +26,7 @@ WIP:
   title: "^WIP:.*"
   mergeable: false
 
-Breaking Change:
+BreakingChange:
   title: "^.*BREAKING CHANGE:.*|.*!.*"
   mergeable: false