dns/knot-resolver: upgrade 3.2.1 -> 4.1.0

PR: 239261
Submitted by: freebsd@dns.company (maintainer)
MFH: 2019Q3
Relnotes: https://www.knot-resolver.cz/2019-07-10-knot-resolver-4.1.0.html

		https://www.knot-resolver.cz/2019-04-18-knot-resolver-4.0.0.html

Security: CVE-2019-10190, CVE-2019-10191