Apply suggestions from code review

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>

Author: timtebeek

src/main/java/org/openrewrite/java/migrate/lombok/NegligentlyConvertEquals.java

@@ -17,6 +17,7 @@
 
 import lombok.EqualsAndHashCode;
 import lombok.Value;
+import org.jspecify.annotations.Nullable;
 import org.openrewrite.ExecutionContext;
 import org.openrewrite.Recipe;
 import org.openrewrite.TreeVisitor;
@@ -85,8 +86,7 @@ public J.ClassDeclaration visitClassDeclaration(J.ClassDeclaration classDecl, Ex
             return classDecl;
         }
 
-
-        @Override
+        public @Nullable J.MethodDeclaration visitMethodDeclaration(J.MethodDeclaration method, ExecutionContext ctx) {
         public J.MethodDeclaration visitMethodDeclaration(J.MethodDeclaration method, ExecutionContext ctx) {
             J.ClassDeclaration classDecl = getCursor().firstEnclosingOrThrow(J.ClassDeclaration.class);