Fix linter error

Author: izmalk

.github/workflows/publish_docs_update.yml

@@ -88,16 +88,16 @@ jobs:
           run: |
             BODY="Automated update of the OpenSearch Dashboards docs submodule to commit [\`${{ github.sha }}\`](https://github.com/canonical/opensearch-dashboards-operator/commit/${{ github.sha }})."
 
-            REVIEWER_FLAG=""
+            REVIEWER_ARGS=()
             if [[ -n "${{ steps.get-reviewers.outputs.REVIEWERS }}" ]]; then
-                REVIEWER_FLAG="--reviewer ${{ steps.get-reviewers.outputs.REVIEWERS }}"
+                REVIEWER_ARGS=(--reviewer "${{ steps.get-reviewers.outputs.REVIEWERS }}")
             fi
 
             PR_URL=$(gh pr create \
                 --title "chore: Update OpenSearch Dashboards docs submodule" \
                 --body "${BODY}" \
                 --base "${{ env.BASE_BRANCH }}" \
                 --head "${PR_BRANCH}" \
-                ${REVIEWER_FLAG}
+                "${REVIEWER_ARGS[@]}"
             )
             echo "- ${PR_URL}" >> "$GITHUB_STEP_SUMMARY"