Bump diagrammer from `a3538ad` to `4bf9c2d` (#124)

Bumps [diagrammer](https://github.com/freechipsproject/diagrammer) from `a3538ad` to `4bf9c2d`.
- [Release notes](https://github.com/freechipsproject/diagrammer/releases)
- [Commits](https://github.com/freechipsproject/diagrammer/compare/a3538adb04d9923fe6f0ef78a3b503dfee055c2d...4bf9c2d5c249c2b52bd946378ab6020aa0fd8e8f

)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>