refactor: Add IRequestOptions type to helpers.request for more type safety (no-changelog) (#8563)

Co-authored-by: कारतोफ्फेलस्क्रिप्ट™ <aditya@netroy.in>

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

@@ -1,6 +1,7 @@
 import type {
 	IDataObject,
 	IExecuteFunctions,
+	IHttpRequestMethods,
 	INodeExecutionData,
 	INodeType,
 	INodeTypeDescription,
@@ -697,7 +698,7 @@ export class Dropbox implements INodeType {
 		const operation = this.getNodeParameter('operation', 0);
 
 		let endpoint = '';
-		let requestMethod = '';
+		let requestMethod: IHttpRequestMethods = 'GET';
 		let returnAll = false;
 		let property = '';
 		let body: IDataObject | Buffer;