Bump graphviz from 0.8.4 to 0.10.1
Bump graphviz from 0.8.4 to 0.10.1

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.8.4 to 0.10.1.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/docs/changelog.rst)
- [Commits](https://github.com/xflr6/graphviz/compare/0.8.4...0.10.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
annapowellsmith/openpresc,ebmdatalab/openprescribing,annapowellsmith/openpresc,annapowellsmith/openpresc,ebmdatalab/openprescribing,ebmdatalab/openprescribing,annapowellsmith/openpresc,ebmdatalab/openprescribing