chore(deps): bump libnpmdiff from 6.0.7 to 6.1.2

Bumps [libnpmdiff](https://github.com/npm/cli/tree/HEAD/workspaces/libnpmdiff) from 6.0.7 to 6.1.2.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/workspaces/libnpmdiff/CHANGELOG.md)
- [Commits](https://github.com/npm/cli/commits/libnpmdiff-v6.1.2/workspaces/libnpmdiff)

---
updated-dependencies:
- dependency-name: libnpmdiff
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>