devel/py-jupyter_client: Update to 6.1.12

Changelog:	https://github.com/jupyter/jupyter_client/blob/6.1.12/docs/changelog.rst

Approved by:	python (with hat)

devel/py-jupyter_client/Makefile

 # $FreeBSD$
 
 PORTNAME=	jupyter_client
-PORTVERSION=	6.1.11
+PORTVERSION=	6.1.12
 CATEGORIES=	devel python
 MASTER_SITES=	CHEESESHOP
 PKGNAMEPREFIX=	${PYTHON_PKGNAMEPREFIX}

devel/py-jupyter_client/distinfo

-TIMESTAMP = 1610450549
-SHA256 (jupyter_client-6.1.11.tar.gz) = 649ca3aca1e28f27d73ef15868a7c7f10d6e70f761514582accec3ca6bb13085
-SIZE (jupyter_client-6.1.11.tar.gz) = 293651
+TIMESTAMP = 1616873075
+SHA256 (jupyter_client-6.1.12.tar.gz) = c4bca1d0846186ca8be97f4d2fa6d2bae889cce4892a167ffa1ba6bd1f73e782
+SIZE (jupyter_client-6.1.12.tar.gz) = 301499