Update toshimaru/auto-author-assign action to v2.1.2

Author: renovate[bot]

.github/workflows/assign-author.yml

@@ -15,4 +15,4 @@ jobs:
 
     steps:
       - name: Assign author
-        uses: toshimaru/auto-author-assign@v2.1.1
+        uses: toshimaru/auto-author-assign@v2.1.2