postfix: Updated (2.5.3 -> 2.5.4)

mail/postfix/postfix.desc

@@ -32,7 +32,7 @@
 
 [L] OpenSource
 [S] Stable
-[V] 2.5.3
+[V] 2.5.4
 [P] X -----5---9 126.900
 
-[D] 3103672049 postfix-2.5.3.tar.gz ftp://ftp.porcupine.org/mirrors/postfix-release/official/
+[D] 3929576433 postfix-2.5.4.tar.gz ftp://ftp.porcupine.org/mirrors/postfix-release/official/