Bump diagrammer from `0017dfa` to `b6443cb` (#259)

Bumps [diagrammer](https://github.com/freechipsproject/diagrammer) from `0017dfa` to `b6443cb`.
- [Release notes](https://github.com/freechipsproject/diagrammer/releases)
- [Commits](https://github.com/freechipsproject/diagrammer/compare/0017dfa3d12abcadda0e6b52cc9bff32a08034e2...b6443cb20e23831348a9eb31b285f60051e27549

)

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

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>