Corepack doesn't recognize the latest pnpm

[ykomatsu]

Corepack assumes that a package manager executable file has ".js" extension:

https://github.com/nodejs/corepack/blob/main/mkshims.ts#L25
https://github.com/nodejs/corepack/blob/main/config.json#L37

But the latest pnpm executable file has ".cjs" extension:

pnpm/pnpm#3305

$ corepack prepare --activate pnpm@6.3.0
Preparing pnpm@6.3.0 for immediate activation...
$ pnpm
node:internal/modules/cjs/loader:944
  throw err;
  ^

Error: Cannot find module '/Users/ykoma/.node/corepack/pnpm/6.3.0/bin/pnpm.js'
    at Function.Module._resolveFilename (node:internal/modules/cjs/loader:941:15)
    at Function.Module._load (node:internal/modules/cjs/loader:774:27)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:76:12)
    at node:internal/main/run_main_module:17:47 {
  code: 'MODULE_NOT_FOUND',
  requireStack: []
}