Chore: update sbt in the project and scripted tests

[kubukoz]

In the build.properties scattered around the codebase, update sbt.version to whatever the latest stable version is (at time of writing, 1.10.0).

[Baccata]

I'd like it if we could sync the version of SBT used in scripted tests with what's actually used by the build. Any idea how we could do this ? It's not like we can use the usual "build-info" trick.

[kubukoz]

Can we modify the scripted task to first iterate over these directories and update if needed?

[Baccata]

possibly

[kubukoz]

I think we could also just delete build.properties in the test directories and it'll automatically use the "parent" sbt's version. That should be optimal.