[DynamoDbSession] Fixed BC test (#649)

Author: Nyholm

.github/workflows/checks.yml

@@ -13,10 +13,15 @@ jobs:
     steps:
       - name: Checkout code
         uses: actions/checkout@v2
+
       - name: Modify composer.json
         run: |
           sed -i -re 's/"require": \{/"minimum-stability": "dev","prefer-stable": true,"require": \{/' composer.json
           cat composer.json
+
+          git config --local user.email "github@async-aws.com"
+          git config --local user.name "AsyncAWS Bot"
           git commit -am "Allow unstable dependencies"
+
       - name: Roave BC Check
         uses: docker://nyholm/roave-bc-check-ga