bump scala to scala3

Author: hcannoodt

.github/workflows/sbt_test.yml

@@ -53,7 +53,7 @@ jobs:
     - name: Set up Scala (via Coursier)
       uses: coursier/setup-action@v2
       with:
-        apps: scala
+        apps: scala3
 
     - name: Set up .NET SDK
       if: ${{ runner.os == 'Linux' }}