yarn: updated to 1.19.1

1.19.1:
Computes the --modules-folder & friends paths based on the cwd.
Stores the sha512 in the cache even when not provided by the server.
Uses the right Node binary when using yarn-path.

1.19.0:
Fixes a potential vulnerability regarding how the build artifacts are stored

1.18.0:
Suggests using the Yarn 2 development trunk on PnP-enabled projects
Preserves linked packages when calling yarn create
Fixes the offline mirror filenames when using Verdaccio
Fixes using link:. to refer to the package folder
Runs the prepare lifecycle of git dependencies even if NODE_ENV is set to production.
Fixes the postversion lifecycle method not being called when using --no-git-tag-version.
Ignores potentially large vscode keys in package.json to avoid E2BIG errors.
Enforces https for the Yarn and npm registries.
Adds support for reading yarnPath from v2-produced .yarnrc.yml files.


(adam)