Update merge_master_to_develop.yml

.github/workflows/merge_master_to_develop.yml

@@ -7,11 +7,10 @@ jobs:
   pull-request:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@master
     - name: pull-request
       uses: repo-sync/pull-request@v2
       with:
-        #source_branch: "master"               # If blank, default: triggered branch
+        source_branch: "master"               # If blank, default: triggered branch
         destination_branch: "develop"         # If blank, default: master
         pr_title: "Merge ${{ github.ref }} into develop"
         pr_body: "Automatically generated PR to keep develop in sync with master. See .github/workflows/merge_master_to_develop.yml"  # Full markdown support, requires pr_title to be set