fix: wait for recursive package installation
fix: wait for recursive package installation

`await [Promise]` returns immediately; we want to wait for each
installation to complete before advancing to the next chunk.

enabling tslint's await-promise rule could have caught this, but
only if the typings for p-limit and graph-sequencer were improved.

pnpm/pnpm,rstacruz/pnpm,rstacruz/pnpm,pnpm/pnpm,rstacruz/pnpm,pnpm/pnpm