Enable feature to draft PR on backport conflict (#12)

Author: masih

.github/workflows/backport.yml

@@ -32,7 +32,7 @@ jobs:
     steps:
       - uses: actions/checkout@v4
       - name: Create backport pull requests
-        uses: korthout/backport-action@v4
+        uses: korthout/backport-action@v4.0.1
         with:
           add_author_as_assignee: 'true'
           copy_assignees: 'true'
@@ -41,3 +41,4 @@ jobs:
             Backport `${target_branch}`: ${pull_title}
           pull_description: |-
             Backport of #${pull_number} to `${target_branch}`.
+          conflict_resolution: draft_commit_conflicts