CI: Update release branch to 1.0.31

Author: ting-yuan

.github/workflows/auto-merge.yml

@@ -19,7 +19,7 @@ jobs:
       - uses: actions/checkout@v2
         with:
           fetch-depth: 0
-          ref: 1.0.30-release
+          ref: 1.0.31-release
 
       - name: merge commits from main to release branch
         run: |