Add release notes for #10050 in 4.2.1

CHANGELOG.txt

@@ -1,6 +1,13 @@
 Changelog
 =========
 
+
+4.2.1 (xx.xx.xxxx) - IN DEVELOPMENT
+~~~~~~~~~~~~~~~~~~
+
+ * Fix: Support creating `StructValue` copies (Tidiane Dia)
+
+
 4.2 (06.02.2023)
 ~~~~~~~~~~~~~~~~
 

docs/releases/4.2.1.md

@@ -0,0 +1,16 @@
+# Wagtail 4.2.1 release notes - IN DEVELOPMENT
+
+_Unreleased_
+
+```{contents}
+---
+local:
+depth: 1
+---
+```
+
+## What's new
+
+### Bug fixes
+
+ * Support creating `StructValue` copies (Tidiane Dia)

docs/releases/index.rst

@@ -5,6 +5,7 @@ Release notes
    :maxdepth: 1
 
    upgrading
+   4.2.1
    4.2
    4.1.3
    4.1.2