add zeus-cpp copyright to the end of ASF license

Signed-off-by: Junwang Zhao <[email protected]>

Author: zhjwpku

src/iceberg/expected.h

@@ -15,6 +15,8 @@
  * KIND, either express or implied.  See the License for the
  * specific language governing permissions and limitations
  * under the License.
+ *
+ * Copyright (c) 2024 zeus-cpp
  */
 
 #pragma once