Fix issue labeler applying incorrect label for libc++abi issues (#67811)

Author: Endilll

.github/new-issues-labeler.yml

@@ -10,8 +10,8 @@
 'libc++':
   - '/libc[+x]{2}(?!\-)/i'
 
-'libc++-abi':
-  - '/libc[+x]{2}-abi/i'
+'libc++abi':
+  - '/libc[+x]{2}-?abi/i'
 
 'libc':
   - '/\blibc(?![-+])\b/i'