Fix wrong date in changelog.md entry

BinderDavid · Bodigrim · commit 3b4123b08221 · 2024-05-29T19:24:28.000+01:00
diff --git a/changelog.md b/changelog.md
@@ -1,6 +1,6 @@
 # Changelog for [`unix` package](http://hackage.haskell.org/package/unix)
 
-## 2.8.5.1 *Apr 2023*
+## 2.8.5.1 *Apr 2024*
 
   * fix building with newer filepath/os-string when `#ifndef HAVE_OPENPTY`
 
