fix: Fix issue with Qdrant not always connecting (#14328)

Co-authored-by: Yiorgis Gozadinos <ggozadinos@gmail.com>

packages/@n8n/nodes-langchain/credentials/QdrantApi.credentials.ts

@@ -42,9 +42,7 @@ export class QdrantApi implements ICredentialType {
 	test: ICredentialTestRequest = {
 		request: {
 			baseURL: '={{$credentials.qdrantUrl}}',
-			headers: {
-				accept: 'application/json; charset=utf-8',
-			},
+			url: '/collections',
 		},
 	};
 }