Bump graphviz from 0.14.1 to 0.14.2

Bumps [graphviz](https://github.com/xflr6/graphviz) from 0.14.1 to 0.14.2.
- [Release notes](https://github.com/xflr6/graphviz/releases)
- [Changelog](https://github.com/xflr6/graphviz/blob/master/CHANGES.txt)
- [Commits](xflr6/graphviz@0.14.1...0.14.2)

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

requirements.txt

@@ -1,5 +1,5 @@
 ansible>=2.8.0
-graphviz==0.14.1
+graphviz==0.14.2
 colour==0.1.5
 lxml==4.5.2
 packaging==20.4