Fix bash test by escaping quotes

Author: noti0na1

compiler/test/dotty/tools/scripting/BashExitCodeTests.scala

@@ -73,7 +73,7 @@ class BashExitCodeTests:
   @Test def xPluginList   = scala("-Xplugin-list")(0)
   @Test def vPhases       = scala("-Vphases")(0)
 
-  @Test def replEval      = repl("--repl-eval", "--repl-init-script", "println(\"Hello from init script!\"); val i = 2 * 2")(0)
+  @Test def replEval      = repl("--repl-eval", "--repl-init-script", "\'println(\"Hello from init script!\"); val i = 2 * 2\'")(0)
 
   /** A utility for running two commands in a row, like you do in bash. */
   extension (inline u1: Unit) inline def & (inline u2: Unit): Unit = { u1; u2 }