Use org.jspecify.annotations.Nullable

Author: timtebeek

src/main/java/org/openrewrite/java/migrate/lang/var/DeclarationCheck.java

@@ -15,11 +15,10 @@
  */
 package org.openrewrite.java.migrate.lang.var;
 
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.Cursor;
 import org.openrewrite.java.tree.*;
 
-import javax.annotation.Nullable;
-
 import static java.util.Objects.requireNonNull;
 
 final class DeclarationCheck {