net/exabgp4: Update to 4.2.21

Approved by:	maintainer (via private email)

net/exabgp4/Makefile

@@ -1,6 +1,5 @@
 PORTNAME=	exabgp
-PORTVERSION=	4.2.13
-PORTREVISION=	2
+PORTVERSION=	4.2.21
 CATEGORIES=	net
 MASTER_SITES=	GH \
 		ZI

net/exabgp4/distinfo

@@ -1,3 +1,3 @@
-TIMESTAMP = 1628777729
-SHA256 (Exa-Networks-exabgp-4.2.13_GH0.tar.gz) = 13add263c895fe4459bd4b62b92a1299c7039dcd99d3b074464e3c19029ad5e7
-SIZE (Exa-Networks-exabgp-4.2.13_GH0.tar.gz) = 2932003
+TIMESTAMP = 1663076170
+SHA256 (Exa-Networks-exabgp-4.2.21_GH0.tar.gz) = 5d5ce6e973fc966fa6aed4a1033b63722d95c8f8ba7bb44659694d659c3f7b7b
+SIZE (Exa-Networks-exabgp-4.2.21_GH0.tar.gz) = 2933721

net/exabgp4/files/patch-lib_exabgp_reactor_network_outgoing.py

@@ -1,11 +0,0 @@
---- lib/exabgp/reactor/network/outgoing.py.orig	2021-03-19 09:29:00 UTC
-+++ lib/exabgp/reactor/network/outgoing.py
-@@ -53,6 +53,8 @@ class Outgoing(Connection):
-             connect(self.io, self.peer, self.port, self.afi, self.md5)
-             return None
-         except Exception as exc:
-+            self.io.close()
-+            self.io = None
-             return exc
- 
-     def establish(self):