Bump installer/nxt-tools in the small-apps group

Bumps the small-apps group with 1 update: [installer/nxt-tools](https://github.com/trikset/nxt-tools).


Updates `installer/nxt-tools` from `dff80a0` to `6c4d5f1`
- [Commits](trikset/nxt-tools@dff80a0...6c4d5f1)

---
updated-dependencies:
- dependency-name: installer/nxt-tools
  dependency-type: direct:production
  dependency-group: small-apps
...

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Author: dependabot[bot]