fix: unlink the outDir twice will report an error

[ahaoboy]

no such file or directory, unlink '...\dist\A.mjs'

import { defineConfig } from "tsup";
import type { Options } from "tsup";
export default defineConfig((options) => {
  const common: Options = {
    clean: true,
  };

  return [
    { ...common, entry: ["./src/A.ts"], outDir: "./dist" },
    { ...common, entry: ["./src/B.ts"], outDir: "./dist" },
  ];
});

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[github-actions]

🎉 This PR is included in version 5.12.0 🎉

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