K2: delay jspecify strict mode introduction to version 2.1

Related to KT-62352, KT-55586

compiler/testData/cli/jvm/jspecifyDefault.out

@@ -1,4 +1,7 @@
-compiler/testData/cli/jvm/jspecifyUsage.kt:2:11: error: null cannot be a value of a non-null type 'kotlin.String'.
+compiler/testData/cli/jvm/jspecifyUsage.kt:2:11: warning: Java type mismatch: inferred type is 'kotlin.String', but 'kotlin.Nothing?' was expected.
     a.foo(null)
           ^
-COMPILATION_ERROR
+compiler/testData/cli/jvm/jspecifyUsage.kt:3:5: warning: only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type 'kotlin.String?'.
+    a.bar().hashCode()
+    ^
+OK

core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JavaNullabilityAnnotationSettings.kt

@@ -45,12 +45,12 @@ val NULLABILITY_ANNOTATION_SETTINGS: NullabilityAnnotationStates<JavaNullability
         FqName("lombok") to JavaNullabilityAnnotationsStatus.DEFAULT,
         JSPECIFY_OLD_ANNOTATIONS_PACKAGE to JavaNullabilityAnnotationsStatus(
             reportLevelBefore = ReportLevel.WARN,
-            sinceVersion = KotlinVersion(2, 0),
+            sinceVersion = KotlinVersion(2, 1),
             reportLevelAfter = ReportLevel.STRICT
         ),
         JSPECIFY_ANNOTATIONS_PACKAGE to JavaNullabilityAnnotationsStatus(
             reportLevelBefore = ReportLevel.WARN,
-            sinceVersion = KotlinVersion(2, 0),
+            sinceVersion = KotlinVersion(2, 1),
             reportLevelAfter = ReportLevel.STRICT
         ),
         RXJAVA3_ANNOTATIONS_PACKAGE to JavaNullabilityAnnotationsStatus(