Update monaco's version to a more recent version

Proposal

We want to be able to benefit from recent improvements shipped in monaco when using the Source Editor.

This issue needs to be filled with more details on the iterative plan ahead. Potentially promoted to an Epic to catch all the intermediate steps.

Context

We had a call on 2021-04-22 to discuss the hurdles and this was one of the actionable items: https://www.youtube.com/watch?v=a2qk-2sq-yk