Improved CI

Changed the scala setup plugin to a maintained action.
Pipeline to check if the format is correct.
Added a cache to improve the speed in CI runs.
Updated checkout action to the latest version.

.github/workflows/ci-quality.yml

@@ -21,15 +21,3 @@ jobs:
       - name: ScalaFmt
         id: fmt
         run: sbt scalafmtCheckAll
-        continue-on-error: true
-      - name: Compilation or tests failed
-        if: ${{steps.fmt.conclusion == 'failure' }}
-        uses: actions/github-script@v7
-        with:
-          script: |
-            github.rest.issues.createComment({
-              issue_number: context.issue.number,
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              body: 'The code needs to be formated. Run "sbt scalafmtAll" from the command line in the root of your project or "scalafmtAll" from the sbt cli and push again.'
-            })