Lock script wrapper tests on the internally used Scala 2.13 version

[Gedochao]

https://github.com/VirtusLab/scala-cli/actions/runs/8001275750/job/21865919147#step:4:10129

integration.test.native 2 tests failed: 
  scala.cli.integration.ScriptWrapperTests.BSP App object wrapper forced with //> using scala 2.13 scala.cli.integration.ScriptWrapperTests.BSP App object wrapper forced with //> using scala 2.13
  scala.cli.integration.ScriptWrapperTests.BSP App object wrapper forced with --scala 2.13 scala.cli.integration.ScriptWrapperTests.BSP App object wrapper forced with --scala 2.13

This should fix the failing script wrapper tests on the CI.
The cause seems to be something with 2.13.13.
Not sure what just yet, but we'll have to figure it out before we bump it.