[SPARK-51038][INFRA] Add branch-4.0 to daily Publish Snapshot Git…

…Hub Action job

### What changes were proposed in this pull request?

This PR aims to add `branch-4.0` to daily `Publish Snapshot` GitHub Action job.

### Why are the changes needed?

After creating `branch-4.0` on 2025-01-15, there is no new publishing because `master` branch is now `4.1.0-SNAPSHOT`.
- https://repository.apache.org/content/groups/snapshots/org/apache/spark/spark-core_2.13/4.0.0-SNAPSHOT/

<img width="824" alt="Screenshot 2025-01-29 at 20 57 24" src="https://github.com/user-attachments/assets/957eecf2-3b56-4e71-be6f-da601b8aa5c4" />

### Does this PR introduce _any_ user-facing change?

No, this is an infra-only change.

### How was this patch tested?

Manual review.

### Was this patch authored or co-authored using generative AI tooling?

No.

Closes #49732 from dongjoon-hyun/SPARK-51038.

Authored-by: Dongjoon Hyun <[email protected]>
Signed-off-by: yangjie01 <[email protected]>

.github/workflows/publish_snapshot.yml

@@ -28,7 +28,7 @@ on:
         description: 'list of branches to publish (JSON)'
         required: true
         # keep in sync with default value of strategy matrix 'branch'
-        default: '["master", "branch-3.5"]'
+        default: '["master", "branch-4.0", "branch-3.5"]'
 
 jobs:
   publish-snapshot:
@@ -38,7 +38,7 @@ jobs:
       fail-fast: false
       matrix:
         # keep in sync with default value of workflow_dispatch input 'branch'
-        branch: ${{ fromJSON( inputs.branch || '["master", "branch-3.5"]' ) }}
+        branch: ${{ fromJSON( inputs.branch || '["master", "branch-4.0", "branch-3.5"]' ) }}
     steps:
     - name: Checkout Spark repository
       uses: actions/checkout@v4