Bump src/3dparty/JNet from 781a50b to 424871d

Bumps [src/3dparty/JNet](https://github.com/masesgroup/JNet) from `781a50b` to `424871d`.
- [Release notes](https://github.com/masesgroup/JNet/releases)
- [Commits](masesgroup/JNet@781a50b...424871d)

---
updated-dependencies:
- dependency-name: src/3dparty/JNet
  dependency-type: direct:production
...

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