Added branch to 4.0 release workflow

.github/workflows/release_40x.yml

@@ -19,6 +19,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
+          ref: 'release/4.0.x'
 
       - name: Set up JDK
         uses: actions/setup-java@v1
@@ -53,6 +54,7 @@ jobs:
         uses: actions/checkout@v2
         with:
           fetch-depth: 0
+          ref: 'release/4.0.x'
 
       - name: Set up JDK
         uses: actions/setup-java@v1