ext/sodium: Add new AEGIS constants to UPGRADING file (#13673)

Follow-up to #12867
[ci skip]

Author: Ayesh

UPGRADING

@@ -541,6 +541,16 @@ PHP 8.4 UPGRADE NOTES
 - Sockets:
   . SO_EXCLUSIVEADDRUSE (Windows only).
 
+- Sodium:
+  . SODIUM_CRYPTO_AEAD_AEGIS128L_KEYBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS128L_NSECBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS128L_NPUBBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS128L_ABYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS256_KEYBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS256_NSECBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS256_NPUBBYTES
+  . SODIUM_CRYPTO_AEAD_AEGIS256_ABYTES
+
 - XML:
   . Added XML_OPTION_PARSE_HUGE to allow large inputs in xml_parse and
     xml_parse_into_struct.