pnpm 9.8.0 on Node.js NPM

Minor Changes

Added a new command for upgrading pnpm itself when it isn't managed by Corepack: pnpm self-update. This command will work, when pnpm was installed via the standalone script from the pnpm installation page #8424.
When executed in a project that has a packageManager field in its package.json file, pnpm will update its version in the packageManager field.

CLI tools installed in the root of the workspace should be added to the PATH, when running scripts and use-node-version is set.
pnpm setup should never switch to another version of pnpm.
This fixes installation with the standalone script from a directory that has a package.json with the packageManager field. pnpm was installing the version of pnpm specified in the packageManager field due to this issue.
Ignore non-string value in the os, cpu, libc fields, which checking optional dependencies #8431.
Remember the state of edit dir, allow running pnpm patch-commit the second time without having to re-run pnpm patch.