Bumped version to 1.3.5.post16

Updated vendor constant enumerations at Sat May  3 10:05:31 UTC 2025. The following files
have been changed: pcapkit/const/reg/apptype.py

Author: github-actions[bot]

conda/build

@@ -1 +1 @@
-2
+0

pcapkit/__init__.py

@@ -121,4 +121,4 @@
 ]
 
 #: version number
-__version__ = '1.3.5.post15'
+__version__ = '1.3.5.post16'

pcapkit/const/reg/apptype.py

@@ -214,8 +214,8 @@ def __hash__(self) -> 'int':
     #: - [UDP] any private mail system
     any_private_mail_system: 'AppType' = 24, 'any_private_mail_system', TransportProtocol.get('tcp') | TransportProtocol.get('udp')
 
-    #: - [TCP] Simple Mail Transfer [:rfc:`5321`]
-    #: - [UDP] Simple Mail Transfer [:rfc:`5321`]
+    #: - [TCP] Simple Mail Transfer [RFC-ietf-emailcore-rfc5321bis-43]
+    #: - [UDP] Simple Mail Transfer [RFC-ietf-emailcore-rfc5321bis-43]
     smtp: 'AppType' = 25, 'smtp', TransportProtocol.get('tcp') | TransportProtocol.get('udp')
 
     #: - [TCP] Unassigned