Pin graphviz to 8 #4538

Job	Run time
[Tags:[email protected]@Release]	42m 12s
[conda:Tags:Default@ubuntu-latest@Release]	46m 12s
[conda:Tags:Unstable@ubuntu-latest@Release]	40m 56s
[docker:Tags:Default@ubuntu:focal@Debug]	38m 18s
[Tags:[email protected]@Release]	35m 14s
[conda:Tags:Default@macos-latest@Release]	1h 2m 40s
[docker:Tags:Unstable@ubuntu:focal@Debug]	34m 52s
[conda:Tags:Unstable@macos-latest@Release]	6m 38s
[Tags:[email protected]@Release]	43m 1s
[docker:Tags:Default@ubuntu:jammy@Debug]	35m 1s
[conda:Tags:Default@windows-2019@Release]	1h 27m 39s
[docker:Tags:Unstable@ubuntu:jammy@Debug]	25m 15s
[Tags:Default@windows-2019@Release]	1h 3m 51s
[conda:Tags:Unstable@windows-2019@Release]	1h 29m 27s
[docker:Tags:Default@debian:buster-backports@Debug]	19m 12s
[Tags:Unstable@windows-2019@Release]	57m 10s
[conda:Tags:Default@windows-2022@Release]	1h 30m 16s
[docker:Tags:Unstable@debian:buster-backports@Debug]	15m 40s
[Tags:LatestReleases@windows-2019@Release]	1h 0m 10s
[conda:Tags:Unstable@windows-2022@Release]	1h 25m 4s
[docker:Tags:Default@debian:bullseye@Debug]	33m 36s
[Tags:@macos-latest@Release]	10s
[docker:Tags:Unstable@debian:bullseye@Debug]	29m 15s
	17h 21m 49s

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