Bugfix: update flowRunArtifact positions on child render

[brandonreid]

Since turning flowRunArtifact into essentially a thin wrapper for artifact and artifactCluster that handles position, I discovered that positions weren't being called when the child render functions were fired, resulting in false positioning.

https://github.com/PrefectHQ/graphs/assets/6776415/0cecc14a-1d4c-4874-9cf7-e11b2bce6084

Now the updatePosition function is always called after the child render functions are.

https://github.com/PrefectHQ/graphs/assets/6776415/67ae0dd1-1a7a-46d8-9bbe-ff64acf1d171

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