Revert "Bump actions/labeler from 4 to 5 (rust-lang#2917)" (rust-lang#2923)

This reverts commit c59c557. See rust-lang#2922.

Author: tautschnig

.github/workflows/extra_jobs.yml

@@ -37,7 +37,7 @@ jobs:
 
     - name: Label PR
       id: labeler
-      uses: actions/labeler@v5
+      uses: actions/labeler@v4
       with:
         dot: true