chore(deps): update kentaro-m/auto-assign-action action to v1.2.6

Author: renovate[bot]

.github/workflows/auto-assign.yml

@@ -7,7 +7,7 @@ jobs:
   add-reviews:
     runs-on: ubuntu-latest
     steps:
-      - uses: kentaro-m/auto-assign-action@v1.2.5
+      - uses: kentaro-m/auto-assign-action@v1.2.6
         with:
           configuration-path: '.github/configs/auto_assign.yml'
 # ref : https://github.com/marketplace/actions/auto-assign-action