Remove the `use-inline-specifiers-lockfile-format=true` pnpm option
from our `.npmrc` file.
This was added in
[PNPM version v7.7.0](https://github.com/pnpm/pnpm/releases/tag/v7.7.0)
and should make our `pnpm-lock.yaml` file much nicer,
but unfortunately, renovate doesn't seem to support it (unsure why?).
This means that whenever we do a `pnpm install` locally, the lock-file
gets changed, and whenever renovate makes a PR, it changes the
lock-file back. This causes a lot of unnecassary merge conflicts.
