net-mgmt/ipv6calc: Update to 4.1.0

Changes:	https://github.com/pbiering/ipv6calc/releases

net-mgmt/ipv6calc/Makefile

 PORTNAME=	ipv6calc
-PORTVERSION=	4.0.2
+PORTVERSION=	4.1.0
 CATEGORIES=	net-mgmt
 MASTER_SITES=	https://www.bieringer.de/ftp/pub/linux/IPv6/ipv6calc/ \
 		https://www.deepspace6.net/ftp/pub/ds6/sources/ipv6calc/

net-mgmt/ipv6calc/distinfo

-TIMESTAMP = 1674589532
-SHA256 (ipv6calc-4.0.2.tar.gz) = f96a89bdce201ec313f66514ee52eeab5f5ead3d2ba9efe5ed9f757632cd01a1
-SIZE (ipv6calc-4.0.2.tar.gz) = 1760941
+TIMESTAMP = 1688166080
+SHA256 (ipv6calc-4.1.0.tar.gz) = 9c42edd9998f13465d275a3124cfdf72c93fd793d38f6d732124ac3f4b84e36e
+SIZE (ipv6calc-4.1.0.tar.gz) = 1801451