main/graphviz: upgrade to 2.47.0
Ref https://gitlab.com/graphviz/graphviz/-/blob/master/CHANGELOG.md#2470-2021-03-15
Size difference for graphviz-doc: 5104 KiB -> 2960 KiB
/cc @ncopa
Edited by Andy Postnikov
Ref https://gitlab.com/graphviz/graphviz/-/blob/master/CHANGELOG.md#2470-2021-03-15
Size difference for graphviz-doc: 5104 KiB -> 2960 KiB
/cc @ncopa