refactor: Use NodeConnectionType consistently across the code base (no-changelog) (#10595)

packages/nodes-base/nodes/Brevo/Brevo.node.ts

@@ -1,5 +1,6 @@
 /* eslint-disable n8n-nodes-base/node-filename-against-convention */
 import type { INodeType, INodeTypeDescription } from 'n8n-workflow';
+import { NodeConnectionType } from 'n8n-workflow';
 import { attributeFields, attributeOperations } from './AttributeDescription';
 import { contactFields, contactOperations } from './ContactDescription';
 import { emailFields, emailOperations } from './EmailDescription';
@@ -18,8 +19,8 @@ export class Brevo implements INodeType {
 		defaults: {
 			name: 'Brevo',
 		},
-		inputs: ['main'],
-		outputs: ['main'],
+		inputs: [NodeConnectionType.Main],
+		outputs: [NodeConnectionType.Main],
 		credentials: [
 			{
 				name: 'sendInBlueApi',