Bump ip-sub from 1.3.9 to 1.5.1

Bumps [ip-sub](https://github.com/massimocandela/ip-sub) from 1.3.9 to 1.5.1.
- [Release notes](https://github.com/massimocandela/ip-sub/releases)
- [Commits](massimocandela/ip-sub@v1.3.9...v1.5.1)

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

Signed-off-by: dependabot[bot] <support@github.com>