Missing changes entry about OPENSSL_str[n]casecmp

Reviewed-by: Paul Dale <pauli@openssl.org>
Reviewed-by: Tomas Mraz <tomas@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/18302)
diff --git a/CHANGES.md b/CHANGES.md
index 47e5aae..4f256e6 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -120,6 +120,13 @@
 
 ### Changes between 3.0.2 and 3.0.3
 
+ * Case insensitive string comparison is reimplemented via new locale-agnostic
+   comparison functions OPENSSL_str[n]casecmp always using the POSIX locale for
+   comparison. The previous implementation had problems when the Turkish locale
+   was used.
+
+   *Dmitry Belyavskiy*
+
  * Fixed a bug in the c_rehash script which was not properly sanitising shell
    metacharacters to prevent command injection.  This script is distributed by
    some operating systems in a manner where it is automatically executed.  On