upload-artefact version bumped

Author: PennyHow

.github/workflows/process_test.yml

@@ -53,7 +53,8 @@ jobs:
             python3 $GITHUB_WORKSPACE/main/src/pypromice/process/get_l2tol3.py -c $GITHUB_WORKSPACE/aws-l0/metadata/station_configurations/ -i $GITHUB_WORKSPACE/out/L0toL2/${i}/${i}_hour.nc -o $GITHUB_WORKSPACE/out/L2toL3/ --data_issues_path $GITHUB_WORKSPACE/data_issues
           done
       - name: Upload test output
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: result
           path: out
+          retention-days: 21