Fix bisect script to emit bash compliant script code (#18167)

The bisection script had a bug introduced in #18157 that was failing at
runtime when executing bisect

Author: nicolasstucki

Diff for: project/scripts/bisect.scala

@@ -235,7 +235,7 @@ class CommitBisect(validationScript: File, shouldFail: Boolean, bootstrapped: Bo
     val scala3CompilerProject = if bootstrapped then "scala3-compiler-bootstrapped" else "scala3-compiler"
     val scala3Project = if bootstrapped then "scala3-bootstrapped" else "scala3"
     val validationCommandStatusModifier = if shouldFail then "! " else "" // invert the process status if failure was expected
-    val bisectRunScript = s"""
+    val bisectRunScript = raw"""
       |scalaVersion=$$(sbt "print ${scala3CompilerProject}/version" | tail -n1)
       |rm -r out
       |sbt "clean; set every doc := new File(\"unused\"); set scaladoc/Compile/resourceGenerators := (\`${scala3Project}\`/Compile/resourceGenerators).value; ${scala3Project}/publishLocal"