Update outdated `JavascriptSnippet`

[marklagendijk]

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Is your feature request related to a problem? The JavascriptSnippet for clientside tracking is outdated. It is currently sv:5 while the latest version is sv:8.

Describe the solution you'd like. Please update to the latest snippet version so that we get the latest fixes and improvements.

Additional context. Using the automatic snippet is supposed to take away the hassle of maintaining it manually. This only works if it is kept up to date. I came to here after a long investigation into why I was seeing an issue that was already solved years ago. In the end I found out that it was caused by the outdated snippet.