@Frederic-Georges_MARAND and I spoke offline, but I wanted to just note some things here for others that might be browsing.
The PR for upgrading mongo-tools to the MongoDB Go Driver 1.16.0 has been merged and will be part of the release 100.10.0: TOOLS-3616 Update go driver version to 1.16 by tdq45gj · Pull Request #704 · mongodb/mongo-tools · GitHub
I would like to know if MongoDB would consider a PR upgrading this driver version and what it would take beyond passing
go test ./.... in the repo to have it considered.
As a general principle, the mongo-tools team said that they are open to PRs. Contributing guidelines are here: mongo-tools/CONTRIBUTING.md at master · mongodb/mongo-tools · GitHub