update import line

packages/pluginkit/src/v4/server/utils/common/validate-growi-plugin-directive.ts

@@ -1,4 +1,4 @@
-import { GrowiPluginType } from '@growi/core';
+import type { GrowiPluginType } from '@growi/core';
 
 import { type GrowiPluginValidationData, GrowiPluginValidationError } from '../../../../model';