Upgrade scala

[seblm]

• Update Scala from 2.11.6 to 3.3.1
• Update ScalaTest from 2.11_2.2.4 to 3_3.2.17
• Lock sbt version
• Introduce a GitHub Action to ensure project can be compiled without any error

The only code change introduced by updating major Scala version is that do {} while () control structure doesn't exist anymore.

Adding a GitHub Action is not mandatory but can be usefull to ensure any modifications. You can see a successful run of this action.