taro4.0 beta更新esbuild 版本至0.20.2

[inooNgt]

esbuild 0.20.1 更新修复了目录权限问题，希望taro4.0 beta版本也更新

Fix a crash when resolving a path from a directory that doesn't exist (evanw/esbuild#3634)

This release fixes a regression where esbuild could crash when resolving an absolute path if the source directory for the path resolution operation doesn't exist. While this situation doesn't normally come up, it could come up when running esbuild concurrently with another operation that mutates the file system as esbuild is doing a build (such as using git to switch branches). The underlying problem was a regression that was introduced in version 0.18.0.