security/py-asyncssh: Update to 2.7.0

Changes:	https://github.com/ronf/asyncssh/blob/master/docs/changes.rst

security/py-asyncssh/Makefile

 PORTNAME=	asyncssh
-PORTVERSION=	2.6.0
+PORTVERSION=	2.7.0
 CATEGORIES=	security python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

security/py-asyncssh/distinfo

-TIMESTAMP = 1620298648
-SHA256 (asyncssh-2.6.0.tar.gz) = 20f0ef553a1e64a7d38db86ba3a2f3907e72f1e81f3dfec5edb191383783c7d1
-SIZE (asyncssh-2.6.0.tar.gz) = 419074
+TIMESTAMP = 1624189751
+SHA256 (asyncssh-2.7.0.tar.gz) = 185013d8e67747c3c0f01b72416b8bd78417da1df48c71f76da53c607ef541b6
+SIZE (asyncssh-2.7.0.tar.gz) = 420765