⚡ Simplify more property types in credentials classes (#2211)

* ⚡ Simplify more property types

* 👕 Fix lint

packages/nodes-base/credentials/FormstackApi.credentials.ts

@@ -1,6 +1,6 @@
 import {
 	ICredentialType,
-	NodePropertyTypes,
+	INodeProperties,
 } from 'n8n-workflow';
 
 
@@ -8,11 +8,11 @@ export class FormstackApi implements ICredentialType {
 	name = 'formstackApi';
 	displayName = 'Formstack API';
 	documentationUrl = 'formstackTrigger';
-	properties = [
+	properties: INodeProperties[] = [
 		{
 			displayName: 'Access Token',
 			name: 'accessToken',
-			type: 'string' as NodePropertyTypes,
+			type: 'string',
 			default: '',
 		},
 	];