[ci skip] Add missing colons in NEWS

Author: TimWolla

NEWS

@@ -12,10 +12,10 @@ PHP                                                                        NEWS
   . Fixed bug GH-11601 (Incorrect handling of unwind and graceful exit
     exceptions). (ilutov)
 
-- OpenSSL
+- OpenSSL:
   . Added support for additional EC parameters in openssl_pkey_new. (Eno-CN)
 
-- Random
+- Random:
   . Deprecate MT_RAND_PHP. (timwolla)
 
 06 Jul 2023, PHP 8.3.0alpha3