Bump ipython from 7.4.0 to 7.16.3 in /tools/hexconverter (#16)

Bumps [ipython](https://github.com/ipython/ipython) from 7.4.0 to 7.16.3.
- [Release notes](https://github.com/ipython/ipython/releases)
- [Commits](ipython/ipython@7.4.0...7.16.3)

---
updated-dependencies:
- dependency-name: ipython
  dependency-type: direct:production
...

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