Replace "jet" package name with "kotlin" in testData

compiler/testData/codegen/boxWithJava/functions/unrelatedUpperBounds.kt

@@ -1,3 +1,3 @@
 fun box(): String {
-    return unrelatedUpperBounds.id("OK" as java.lang.String)!! as jet.String
+    return unrelatedUpperBounds.id("OK" as java.lang.String)!! as kotlin.String
 }

compiler/testData/codegen/boxWithJava/sam/adapters/inheritedOverriddenAdapter.java

@@ -7,7 +7,7 @@ class Super {
 }
 
 class Sub extends Super {
-    void foo(jet.Function0<jet.Unit> r) {
+    void foo(kotlin.Function0<kotlin.Unit> r) {
         lastCalled = "sub";
     }
 }