refactor: Migrate to JSpecify (#62)

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.java.jspecify.MigrateFromOpenRewriteAnnotations?organizationId=TW9kZXJuZQ%3D%3D

Co-authored-by: Moderne <team@moderne.io>
Co-authored-by: Tim te Beek <tim@moderne.io>

src/main/java/com/yourorg/AppendToReleaseNotes.java

@@ -17,8 +17,8 @@
 
 import lombok.EqualsAndHashCode;
 import lombok.Value;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.*;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.text.PlainText;
 import org.openrewrite.text.PlainTextParser;
 import org.openrewrite.text.PlainTextVisitor;

src/main/java/com/yourorg/NoCollectionMutation.java

@@ -18,11 +18,11 @@
 import fj.data.Option;
 import lombok.EqualsAndHashCode;
 import lombok.Value;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.*;
 import org.openrewrite.analysis.dataflow.DataFlowNode;
 import org.openrewrite.analysis.dataflow.DataFlowSpec;
 import org.openrewrite.analysis.dataflow.Dataflow;
-import org.openrewrite.internal.lang.Nullable;
 import org.openrewrite.java.JavaTemplate;
 import org.openrewrite.java.JavaVisitor;
 import org.openrewrite.java.MethodMatcher;

src/main/java/com/yourorg/package-info.java

@@ -13,10 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */
-@NonNullApi
+@NullMarked
 @NonNullFields
 package com.yourorg;
-
-// We annotate the package to indicate that fields and methods in this package are non-null by default.
-import org.openrewrite.internal.lang.NonNullApi;
+import org.jspecify.annotations.NullMarked;
 import org.openrewrite.internal.lang.NonNullFields;