[java-annotations] getOrDefault 2nd parameter is marked as nullable

Fixes IDEA-367387 Mismatch between IDEA and JSpecify on HashMap.getDefault(...) nullness

GitOrigin-RevId: 6e90dcdac5b61aa91431f96d007261ad448ea522

java/java-tests/testData/inspection/dataFlow/fixture/JSpecifyGetOrDefault.java

@@ -0,0 +1,13 @@
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+import java.util.HashMap;
+
+@NullMarked
+class Main {
+  HashMap<String, String> map = new HashMap<>();
+
+  public @Nullable String example() {
+    return map.getOrDefault("key", null);
+  }
+}