Update:
The operation went well for the EC2 agents update. Maven 3.8.1 is now generally available.
However, the Azure Agent update did not go as expected: more analysis is required (TL;DR; what looks like to be the latest VM image does not have the expected dependencies).
It should worked tomorrow and should have limited impact (only the builds requiring Maven 3.8.1).
Thanks for your understanding, We'll keep you updated tomorrow (Friday 11th of June).
Damien