style(ts): use import type syntax

Author: xeptore

src/index.ts

@@ -1,6 +1,6 @@
 import commitlintLoad from '@commitlint/load';
-import { PromptModule } from 'inquirer';
-import { Commit } from 'commitizen';
+import type { PromptModule } from 'inquirer';
+import type { Commit } from 'commitizen';
 import { engine } from './engine';
 
 export async function prompter(cz: { prompt: PromptModule }, commit: Commit): Promise<void> {