Update bonsai to latest version

build.sbt

src/main/scala/leon/datagen/GrammarDataGen.scala

src/main/scala/leon/grammars/ExpressionGrammar.scala

src/main/scala/leon/grammars/Generator.scala

src/main/scala/leon/repair/Repairman.scala

src/main/scala/leon/synthesis/ExamplesFinder.scala

...scala/leon/synthesis/disambiguation/QuestionBuilder.scala

src/main/scala/leon/synthesis/rules/BottomUpTegis.scala

src/main/scala/leon/synthesis/rules/TEGISLike.scala