Why is plotly-latest still 1.58.5?


I was wondering why https://cdn.plot.ly/plotly-latest.min.js is still 1.58.5 version, whereas we would expect it to be a 2.X version, as right now on github it is v2.8.3 which is the latest (Release v2.8.3 · plotly/plotly.js · GitHub) ?
All the examples from the doc are based on plotly-latest (1.58.5).

Thank you