Fix copyright years

Hendrik van Antwerpen · Hendrik van Antwerpen · commit 08e87cf85be8 · 2023-03-21T15:51:27.000+01:00
diff --git a/stack-graphs/src/serde/partial.rs b/stack-graphs/src/serde/partial.rs
@@ -1,6 +1,6 @@
 // -*- coding: utf-8 -*-
 // ------------------------------------------------------------------------------------------------
-// Copyright © 2021, stack-graphs authors.
+// Copyright © 2023, stack-graphs authors.
 // Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
 // Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
 // ------------------------------------------------------------------------------------------------
diff --git a/stack-graphs/src/serde/stitching.rs b/stack-graphs/src/serde/stitching.rs
@@ -1,6 +1,6 @@
 // -*- coding: utf-8 -*-
 // ------------------------------------------------------------------------------------------------
-// Copyright © 2021, stack-graphs authors.
+// Copyright © 2023, stack-graphs authors.
 // Licensed under either of Apache License, Version 2.0, or MIT license, at your option.
 // Please see the LICENSE-APACHE or LICENSE-MIT files in this distribution for license details.
 // ------------------------------------------------------------------------------------------------
