dns/flamethrower: Update to 0.10, new dependency gnutls [1]

While here, assign new maintainer [2]

PR: 237622
Submitted by: Andrey Fesenko <andrey@bsdnir.info> [1]
Submitted by: Leo Vandewoestijne <freebsd@dns.company> [2]
Approved by: Leo Vandewoestijne <freebsd@dns.company> [1]