Fix run: Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/parser' is not defined by "exports"

[kosyachniy]

If I use npm run dev or npm run build, I get error:

> next-persist-demo@0.1.0 dev
> next dev

ready - started server on 0.0.0.0:3000, url: http://localhost:3000
info  - Using webpack 4. Reason: future.webpack5 option not enabled https://nextjs.org/docs/messages/webpack5
Error [ERR_PACKAGE_PATH_NOT_EXPORTED]: Package subpath './lib/parser' is not defined by "exports" in /Users/kosyachniy/Desktop/next-persist-demo/node_modules/postcss/package.json
    at new NodeError (node:internal/errors:393:5)
    at exportsNotFound (node:internal/modules/esm/resolve:295:10)
    at packageExportsResolve (node:internal/modules/esm/resolve:631:9)
    at resolveExports (node:internal/modules/cjs/loader:538:36)
    at Module._findPath (node:internal/modules/cjs/loader:607:31)
    at Module._resolveFilename (node:internal/modules/cjs/loader:1025:27)
    at mod._resolveFilename (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/build/webpack/require-hook.js:4:1784)
    at Module._load (node:internal/modules/cjs/loader:885:27)
    at Module.require (node:internal/modules/cjs/loader:1105:19)
    at require (node:internal/modules/cjs/helpers:103:18)
    at 552 (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:11590)
    at __nccwpck_require__ (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:11735)
    at 270 (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:400)
    at __nccwpck_require__ (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:11735)
    at 327 (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:260)
    at __nccwpck_require__ (/Users/kosyachniy/Desktop/next-persist-demo/node_modules/next/dist/compiled/postcss-scss/scss-syntax.js:1:11735) {
  code: 'ERR_PACKAGE_PATH_NOT_EXPORTED'
}

I fixed it.