Extend copyright into 2024

Author: Philippus

NOTICE

@@ -1,8 +1,8 @@
 scala-swing
 
-Copyright (c) 2002-2023 EPFL
-Copyright (c) 2011-2023 Lightbend, Inc.
-Copyright (c) 2019-2023 contributors
+Copyright (c) 2002-2024 EPFL
+Copyright (c) 2011-2024 Lightbend, Inc.
+Copyright (c) 2019-2024 contributors
 
 Licensed under the Apache License, Version 2.0 (the "License").
 Unless required by applicable law or agreed to in writing, software
@@ -12,4 +12,4 @@ See the License for the specific language governing permissions and
 limitations under the License.
 
 See `LICENSE` for full terms.
-This software includes projects with other licenses -- see `docs/licenses/`.
+This software includes projects with other licenses -- see `docs/licenses/`.